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We use simple past tense to tell what happened in the past.
We use the present perfect tense to talk about an action that started in the past and continues to the present.
1. 三年前他养了只猫做宠物。
He ______ a cat as pet three years ago.
2. 这只宠物猫他养了三年了。
He _________ the pet cat for three years.
kept
has kept
Daniel 上个月买了台新电脑。
Daniel bought a new computer last month.
Daniel已经买了台新电脑。
Daniel has bought a new computer.
(Daniel has a new computer now.)
We use the simple past tense to tell what happened in the past.
We use the present perfect tense to talk about the result of an action.
1. 我上个星期去参观了那个新动物园。
I _______ that new zoo last week.
2. 我已经参观过那个新动物园了。
I ____________ that new zoo.
visited
have visited
吴老师2010年和2011年访问过加拿大。
Mr Wu visited Canada in 2010 and 2011.
吴老师已经去过加拿大两次。
Mr Wu has been to Canada twice.
We use the simple past tense to tell what happened in the past.
We use the present perfect tense to tell how many times an action has happened till now.
1. 我上周看过这部电影。
I _____ this movie last week.
2. 我已经看过这部电影很多次。