- 对
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1. perfect tense: up to a point in time
2. present perfect=has/have+past participle(-ed)
3. present perfect: 
present perfect = has/have + past participle[-ed]
perfect tense = up to a point in time
present tense is the tense that shows an action that is still going
present perfect tense is the action from the past up to now/duration from the past up to now.
The simple past is past action
at last , see carfully and pause the video rf you can.
present perfect=has/have+past participle[-ed]
present perfect=DURATION from the past up to now
present perfect =UNSPECIFIED TIME before now
{single past
{present perfect
‘
Simple Tense
*Simple present
*Simple past
*Simple future
Present Perfect
= has / have + past participle(-ed)
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