Tolong dijawab yaa Besok dikumpulkan yaa

1.to tell something again of the past
2.a.since when have you worked
b.how many offices have you worked
3.i have been ever inselted by my schoolmate
4.a.i have swam for three hours
b.she has worked in insurance company for five years
c. They have waited for you for two hours
5.simple past tense tell about past activities and simple present perfect tense tell about something has been done but still has a connection in the present