FOR and SINCE | English grammar class

source: Crown Academy of English         2017年1月16日
In this English grammar class, I give you the explanation about how to use FOR and SINCE.
We use FOR to describe a period of time (duration) from the past present or future. We can use it with any verb tense.
We use SINCE with a point in time from the past. We use it mainly with the perfect tenses, in particular with the present perfect and present perfect continuous.
"Since" gives the starting point. It defines when things began or started.
Examples of points in time are: yesterday, last week, 5 days ago, 2010 and many more.
We often use these 2 words when answering a question like "How long have you been doing something?"
Present perfect: http://www.youtube.com/watch?v=vLIJ9G...
Idioms and phrases: http://www.youtube.com/watch?v=eU3XYl...
Business English expressions and conversation: http://www.youtube.com/watch?v=5cQv8p...
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