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have; have has; has have; has has; have
isn’t it wasn’t it is it was it
since the last century for a very long time since a few hundred years ago since a few years ago
joined; has been has joined; has been was joined; is joined; was
has gone to has been to has been in has been for
science fiction is a fairly new development in literature science fiction is a fairly new development in literature the science fiction usually has obviously political undertones modern science fiction usually has obviously political moderones
proves that the epidemic has been spreading very fast over the past eight years implies that the USAID was not very successful in the past eight years shows that the epidemic has spread too fast to be controlled over the past eight years explains that the epidemic has been controlled
came; has been teaching has been; has been teaching came; have been teaching has gone; have been teaching
has opened has open has been open has been opened
changed; got married changed; has been married has changed; got married has changed; has been married
had driven has been driven has been driving has driven
leaves; has gone left; has been away leaves; has been away left; has gone
seven hundred million one hundred and twenty-five million eight or eight point five thousand million one hundred million
hundred seven hundreds hundreds of seven hundred of
has lived; had prepared has been living; has been preparing lived; has been preparing has been living; has prepared
carried out in the major areas of illiteracy like Africa realized in ten years made by experts in Paris discussed at an international conference
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