The correct form of the verb "promise" in the sentence "He did as he promised." is already correct.
First it is an "invoice" not a "voice". Then the correct sentence is:- Dan reported that the contractor had sent in his invoice.
Yes.
In this sense, "reported to work" is correct. It's just an awkward sentence. You could change he first option to "reporting for work" and that would also be correct, but the position of the preposition is incorrect.
No, The correct grammar for this sentence would be, "He finished doing his homework."
No. The correct way of saying it is: "I promised to send you".
their
No, the sentence is incorrect. Correct: After the professor finished, the class was very confused.
Yes, that sentence is correct. It is a reported speech construction, where the speaker is relaying information they heard from someone else.
Yes it's correct.For example, "would you mind if I finished this later?"Finished is the past tense of finish.
Both are correct. Both are parts of sentence in reported speech. In reported speech it is ok not to use 'that'. He told you that if you come you will have to work hard. He told you if you come you will have to work hard. These sentences are also conditional sentences - if..............will.............
"How are you" is a correct sentence.