The Chinese (invented/have invented) paper.
invented (simple past--historical fact)
This is the third piece of cake that you (ate/have eaten) today.
have eaten (present perfect--from past until present)
My notebook isn’t here anymore. Someone (took/has taken) it.
has taken (present perfect--recent past action affecting/related to present)
The car industry (suffered/has suffered) huge losses since the factory workers began their strike.
has suffered (present perfect--from past until present)
They (finished/had finished) eating dinner by the time I got home.
had finished (past perfect--past even completed before a second past event)
At last, I ___ my project. Now I can take a break. a. completed b. had completed c. have completed d. was completed
c. have completed (present perfect--recent completed action)
How many times ___ to this CD today? a. were you listening b. had you listened c. have you listened d. do you listen
c. have you listened present perfect--from past until present
When I (open) the window, the cat jumped in.
opened (simple past--past actions connected to each other)
He can’t drive us today because he (lost) his car keys.
has lost (present perfect--recent past action affecting/related to past)
When I (finish) washing the dishes, I did some vacuuming.
had finished (past perfect--unconnected past actions)
Find the mistake: He is said to catch the train for Chicago at seven yesterday morning, but nobody knows of his wherebouts now.
catch → have caught (past perfect--reported speech of completed past action)
Find the mistakte: I studied English for the past five years, but I still have difficulty speaking and writing.
studied → have studied (present perfect--from past until present)
Find the mistake: He had given me the report but I haven’t looked at it at all yet.
had given → gave
Find the mistake: When I was in high school, I had often wished to be taller.
had often wished → often wished (simple past--completed action, finished time period)
Find the mistake: He has wished to remarry, but ended up not doing so, probably because of his daughter’s objections.
has wished → had wished (past perfect--unrealized past hope)