The uses of tense (I have sent him only one letter up to now. etc...)

[Gerald]

Kindly check the Grammar of these sentences below:

1.I have sent him only one letter up to now.
2.I shall telephone you when he comes back.
3.It started to rain while we were playing tennis.
4.Iam hearing the strange noise.
5.If you started at once you will arrive by six oclock.
6.He has gone out five minutes ago.
7.He fell asleep while he was driving the car.

thank you.
nick

[Skrej]

[Nanucbe]

1 .I have written him just a letter up to this time
2. I shall telephone you on his return.
3. It started raining while we were playing tennis.
4. I hear the strange noise. (You reported) Otherwise 'I hear a strange noise.' (Hear, remember and some such words are not used in the present particle form. You either hear or don’t; the same with remember.)
5. If you start immediately (now), you will arrive (there) by six o’clock. (The word ‘arrive’ requires a place)
6. He has just gone out.
7. He fell asleep driving.