What is the verb phase in this sentence?

Have you ever written a letter to a secret pal?

Write explanatory essay about the effects of earthquakes.

Which piece of information about doris lessing would more likely be found in the new york times article "doris lessing wins nobel prize in literature" than in the "doris lessing" biographical video? the opinion lessing has of the current political climate in south africa description of the home which lessing and her husband live in today

The tankers are so large how did some crew members get from one point to another while on board