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

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,

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.

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.

Dear CalifJim. I copied it from the Cambridge Grammar of the English Language by Rodney Huddleston (P144-145) I had a hard time reading the description about it by the writer. Here is the passage: Past time adjuncts in experiential

Hi, Here is a sentence from CGOEL: We’ve already discussed it yesterday. The Present Perfect refers to the past until now, so you should reword the sentence this way. We discussed it yesterday. We have already discussed it

Here is a sentence from CGOEL: We’ve already discussed it yesterday. It should be We already discussed it yesterday. And the discussion is over. It is anomalous to use the present perfect ( 've discussed ) with an adverb indicating a

i would like to know two things. the first one is : the past participle of the verb "go", is it "been"? ex: i have been to London. have you ever been to London? i think that "go" in this case has irregular form

Hi, Because with Present Perfect, you need have + past participle . 'Figured' is the past participle. This is why you say I have cooked dinner and not I have cook dinner. Clive