قاعدة before after
شرح استخدام
After / Before / Ago / Since / For
After
- at a later time, behind, following
After I take a pill, I will feel better.
Before
- at any time before now
Have you seen him before?
Ago
- in past time
( it is usually used with a past tense, not with a perfect tense )
He lived here ten years ago.
Since
- from a point in the past until now
( it is normally used with the perfect tense and the past perfect tense )
I have had this bicycle since 1990.
For
- to measure the duration ( how long )
( it can be used with all tenses )
I have had this bicycle for more than 20 years.
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