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6. They have studied English since 1990
(-) ..............................
(?) ..............................
7. The train has just left the station
(-) ..............................
(?) ..............................
8. He has written to me lately
(-) ..............................
(?) ..............................
9. The child has slept for three hours
(-) ..............................
(?) ..............................
10. I have already seen that play before
(-) ..............................
(?) ..............................
6. They have studied English since 1990
(-) They haven't studied English since 1990
(?) Have they studied English since 1990 ?
7. The train has just left the station
(-) The train hasn't just left the station
(?) Hasn't the train just left the station ?
8. He has written to me lately
(-) He hasn't written to me lately
(?) Has he written to you lately ?
9. The child has slept for three hours
(-) The child hasn't slept for three hours
(?) Has the child slept for three hours ?
10. I have already seen that play before
(-) I haven't already seen that play before
(?) Have you already seen that play before ?