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English tense explanations

My ......... is to explain the different uses of the tenses.
The main question is knowing where you .........?
As you ......... know there are many tenses in English.
The problem is ......... you can tell the difference
between, for ........., the Present and Present Perfect.
But I should ......... myself from talking about
particular tenses ......... I've talked about tenses in general.
Please ......... me for going on to the middle of my story
when I should be thinking about the ..........