The first sentence is incorrect, because "yet" cannot stand between "been" and the past participle of the verb (in this case, "studied"). Both forms of the answer (perfect and perfect continuous) show that the man is still in Canada, but the continuous form puts greater stress on. We haven't been studying for two hours. The students want more practice. 5. Study. British: He has money. He hasn't any time. American: He has money.
Hasn’t Been Why More? It Studied
We often use recently and lately with the present perfect continuous. We usually put adverbs of time and duration after the main verb. Some verbs are almost never used in the present perfect continuous.
We use the present perfect instead. The most familiar examples of these are be and know. The stress is on the subject and the present participle. Hidden talents Present perfect continuous. Open unit selector Close unit selector Unit 2 Hidden talents Select a unit 1 Pop-ups 2 Hidden talents 3 Can't buy me love 4 Travellers' tales 5 The colleague from hell 6 Jurassic mystery: Sessions Vocabulary reference Grammar reference.
The present perfect continuous tense Meaning and use We use the present perfect continuous to talk about an activity that started in the past and is continuing now or has recently finished. Form The present perfect continuous is made with: Question Present perfect continuous questions are made with: Have you been eating all the biscuits? There are none left! This is an interesting finding and I agree that it suggests more study of the role of acetylcholine in ADD is warranted.
Have you ever noticed that you taking these makes it more difficult to shift your attention? Simply raising the mean level of acetylcholine present in the brain seems like it might have the downside of putting you in a regime where it is difficult to shift your attention away from something when appropriate, e.
Still, it might be an overall improvement if your main problem is lack of focus. Ideally I would think you'd like upregulate ACh receptor production instead, which would increase the variability of ACh receptor activity as well the mean rate. This obviously might be more difficult to accomplish with a drug though. Is there a way to upregulate Ach receptor production?
That would be amazing but I wasn't aware of a way to do that haha. As for attention switching problems, I've always been extremely prone to hyperfocus and have had problems switching my attention eg in high school I wrote a page novel in four months , but yes I do think those supplements have made it even more difficult for me to switch my attention. I also think that the choline has weighed down my personality a bit, if that makes sense. Like I used to be more excitable and bubbly, but with the CDP choline I feel less able to pivot quickly in conversation, more serious, have less of a sense of humor and feel less able to get genuine joy out of anything.
I find that when I've been forced to miss a couple choline doses I have an easier time making genuine connections with people and am better in social situations-- but without it I'm less able to focus at work and have a hard time holding details and numbers in my head verbally remembering and discussing numbers is a huge stumbling block for me. With choline I'm also more insistent on getting tasks done and find that my task-related memory is much sharper with acetylcholine.
I think most of the benefit for me is memory, which is great because I struggle hugely with memory loss haha. The choline also calms my anxiety, nausea and acid reflux.
I don't know of anyway interventions that have been shown in particular for upregulating ACh receptor production, but I am far from a neuropharmacology expert. It's a ACh precursor? Do you know whether it has been found that ingesting CDP choline raises ACh level in the nervous system?
Interesting and convenient for you that it also helps you with acid reflux--maybe connected to your reduced anxiety or possibly due the ACh receptors in your gut? My stepmother was on an acetylcholinestrase inhibitor for awhile-- it gave her occasional bad bouts of indigestion.
Hmm, you may be on to something. I've been using a multi-nootropic supplement called mind lab pro for the past few months, in conjunction with my prescription of Adderall XR. This supplement contains cytidine diphosphate-choline CDP-Choline , that I decided to use to help with dopamine transmission and oxidative stress. It helped make the effects of the adderall less intense and I felt more clear minded.
But, emotionally, even after being off adderall for a few weeks now, but still supplementing, I'm getting worse.
I'm going to try to go without it for a while and see how things go. Thanks for the idea. So somewhat related question OP, what has ben your experience been with experimenting with nicotine? Because I have ADHD and have noticed that every time I smoke I don't seem to get quite the buzz that others seem to and have never seen the allure of it. I actually haven't experimented with nicotine at all yet--the couple times I've had a cigarette I was way too drunk to feel any buzz lol.
Experimenting with nicotine in non-cigarette form is definitely on my to-do list though. I also have ADHD and use nicotine for minor symptom management unfortunately I'm biologically addicted now and have to stop. I haven't noticed much of a buzz off my vape low nicotine content , but I've noticed that off a cigarette I will do a noticeable sigh of relaxation and relax my body, while experiencing a boost in mood and an increase in sensation.
This happens usually during the first smoke of the day and I haven't had a cigarette for a while. If I smoke 2 cigarettes in a row, the second one does not seem to have an effect.
Study this example situation: 20 Put the verb into the more suitable form, present perfect simple (I have done) or .. (not hasn't been haven't done). subject + have/has/haven't/hasn't + been + present participle of main verb. We put just and The most familiar examples of these are be and know. WRONG. a) The most common use of will is as an auxiliary verb to show future time. her degree she 4) will have been studying/will have studied medicine for five years. . E. Next month, Maggie 1) (go) to Australia to visit her sister, who she hasn't.