Hey, ich muss für die Schule morgen in ein paar Englischen Sätzen die richtigen Verbformen einsetzten, könnte das mal jemand, der Ahnung davon hat, überprüfen? 
danke (in den Klammern steht immer der Infinitiv, den ich dann versucht habe richtig einzusetzten)
Present perfect and past simple
Put the verbs in brackets into the most appropriate form of the present perfect or past simple. Be careful with the word order if there is a question, a negative or if there is an adverb in the sentence.
Someone (ring up) rang up half an hour ago and (say) said. there was a virus in the computer data bank. We (check) checked it but we (not find) have not found anything yet. This is the third alarm we (have) have had this week.
Niyang Chang (be) was our agent in Singapore until the end of last year. After we (terminate) terminated his contract, we opened our own sales office there, and we (sell) have sold our products without a middleman ever since.
Unfortunately, you (not pay) have not paid yet for the goods that we (deliver) delivered last month. If you (settle) settled the invoice in the meantime, please ignore this reminder.
Joan: Your English is excellent. I don't think anyone could tell that you are a foreigner. You (be) have been here for a long time, haven't you?
Pauline: Yes, I (be) was here for over three years.
Harry Smith (work) .worked as our Production Manager for 25 years. Then he (retire) retired and (go) has gone to live in Spain. We are finding it very difficult to replace him although more than 15 people (already apply) already have applied for the job.
The machine we (deliver) delivered two weeks ago (break down) broke down once again. Our Service Engineer still (not repair) has not repaired it and the customer is threatening to sue us for all the production he (lose) has lost
Trevor: (ever try) Have you ever tried to give up smoking, Bob?
Robert: Yes, I (try) tried last year, but then I found that I was getting too fat. I (just complete) just have completed an acupuncture session, and I hope that I'll be able to give it up again.
I don't know what's wrong with the computer at our Newark branch. I (try) tried to log in to it all morning with no success. They're probably servicing the equipment although I (tell) have told them again and again to do it outside normal office hours.
Pat: Why is Mike not in his office?
Graham: I'm not sure, but I think he (have) had a car accident.
Pat: When you (see) saw him last?
Graham: I (not see) haven´t seen him all week.
10. I (know) knew him for many years and can recommend him without hesitation. He is one of the most reliable workers we (ever have) ever have had.
Sarah: What's the matter?
Alan: I think I (forget) forgot the password for the computer.
Although we (work) have worked on the problem for two days now, we are no nearer to finding a solution. It (prove) proved to be much more difficult than we (expect) expected
Sam: The clock is slow.
Jane: It isn't slow, it (stop) stopped again.
We must economize next month. We (spend) spent far too much money on paper since we (install) have installed the new word processing equipment.
Please check this translation for me and tell me whether I (make) made any mistakes.
They (pay) paid the last invoice promptly, which is why I am so surprised that they (not pay) have not paid this one yet. Perhaps there (be) was a mistake in their bookkeeping department.
When he (arrive) arrived at his posting in Taiwan he (start) started learning Chinese. I wonder whether he (finish) has finished the course yet?
Peter: Why are you smiling?
Paul: The boss (just tell) just has told me that I (be promoted) have been promoted, and that's the best news I (have) had for weeks.
