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English Tenses Rules :
The imperative
Simple Present to be
The Simple Present
The Present Continuous
Simple Past of the Verb to be
The Simple Past (Continued)
Spelling of the -ed forms
The past continuous
Future plan
The Simple Future
Future Progressive
Present Perfect Simple
Present Perfect Continuous
For or Since with the Present Perfect
Past Perfect Simple
Future Perfect Continuous
Subjunctive
Conditional Simple
Conditional Progressive
Conditional Perfect

English tenses rules in the use with all forms and rules grammartical.