Can anyone give me example of perfect present past and future tense

When developing a written argument, what best explains why an author would use a graph as a source? a graph gives numeric evidence visually. a graph is easy to read and understand. a graph is colorful and will engage the reader. a graph can be used to refute an argument.

Aids is growing fastest in the poorest countries of africa. these nations don’t have enough doctors, medical labs, or money for medicine. a recent study showed that only a small percentage of hiv-infected children in africa are getting any medical treatment at all. what central idea is emphasized in both sources? the hiv/aids epidemic in africa is serious. the hiv/aids epidemic in south africa is serious. the hiv/aids epidemic among african children is serious. the hiv/aids epidemic among south african children is serious

Boss: oh no! that’s the phone again! secretary: blank boss: . a. shall i take it? b. will you answer it? c. can you do me a favor? d. may i hang it up?