Hi, Have I used present perfect correctly here? Authors recomm e nd that a diver who has suffered pneumocephalus should suspend scuba diving for a/the ?? stated time, at least unti l a few months after pneumocephalus is not vi sible

Have I used present perfect correctly here? Authors recommand that a diver who suffered pneumocephalus has to suspend scuba diving for stated time, at least untill few months after pneumocephalus has not been vi sible on CT scans and all symptoms

My example was in the past tense . On the other hand, the above examples are in the present tense . Can I understand that "He tosses the ball with the left hand." is acceptable if he is left-handed? Tense would not make a difference.

Thank you everyone for your advice. I found the following description in Longman's Comprehensive Grammar of the English Language. "She throws the ball with her left hand ?with her left hand One factor which could make acceptable, and

does anyone know anything about passive voice? i just have a quick question if anyone knows it... I can’t figure out how to switch active voice to passive, without changing the tense. For example, present simple tense, “paints” is active,

"Be" is not a verb that is used in present progressive form too often. " I am not able to concentrate on my studies." This is the only correct form. " I am not being able to concentrate on my

No, the present perfect would be he has walked or he has driven . He used to indicates habitual action in the past that no longer occurs.

Hi I just wondered if someone would be so kind as to just check my answers make sure I have understood correctly. Many thanks in advance. I have to read the following sentences and decide if they use one of the following 4:- the

No, although I suppose it is possible in some scenarios. Here, 'in' is an alternative: I have danced for two hours now. I haven't danced for two hours now. I haven't danced in two hours now.

Hi, 1. I walk and I do walking. What is the difference between these two? The latter is not very idiomatic. It sounds a bit like you are taling about your hobbies. 2. Drink milk before you go to sleep. and Drinking milk before sleeping