What are you doing is the correct 'saying' or pronounciation. What you doing' is slang and is slightly shortened to make life easier, and of course we understand it.
No, The correct grammar for this sentence would be, "He finished doing his homework."
DBA or d/b/a
The correct answer is, they are doing their homework now, or they will do their homework now. The word do can be used as an action verb or an auxiliary verb.
The grammar appears correct even though it is heard more like, "He is capable of doing this job."
You need to give the context if you want a sensible answer. To do is the infinitive.
"How is she doing" is correct.
Were doing this is correct.
Neither. You are doing it...or...You're doing it.
The correct sentence is the following: "What were you doing from before?"
Yes, the phrase 'what they're doing' is grammatically correct. For example: What they're doing is wrong.
No, The correct grammar for this sentence would be, "He finished doing his homework."
It seems correct.
The sentence 'A school housed in the church is doing well,' is grammatically correct.
yes
No. It should say "How is Fred Martin doing?"
no_____If the sentence is You do do that (meaning You are in the habit of doing that) the grammar is perfectly correct and the sentence 'does have correct grammar'.
'The football team is doing well!'