4. He was CEO for 20 years and retired in 2001.
3. Jack Welch took over as CEO of GE in 1981.
2. The company has implemented new sales strategies so, sales have increased.
5. Mike works for Microsoft. He has been with the company for three years now. / Mike has worked at head office since June.
1. In the old days, companies grew slowly.
b) We use the past simple when give the specific time that an event took place.
d) We use the present perfect with “for” and “since” to talk about things that started in the past but continue up to the present.
c) We use the present perfect to show the result of an event without saying when it happened.
a) We use the past simple to talk about things that belong to the past and are finished.
e) We use the past simple with “for” when the activity is finished.
