Tenses: Simple + Continuous v1.0 APK (Unlimited Money)

I went, I was going, I have gone or I had gone to London three times. Which tense do you use in which situation?
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VERB TENSES
Diagnostic test 1 + Table of forms
Present simple + continuous tense
Past simple + continuous tense
Future simple + continuous tense
Present perfect simple + continuous
Past perfect simple + continuous
Future perfect simple + continuous

ENGLISH VERB FORMS
Diagnostic test 2 + Table of forms
Going to
Passive voice
Time clauses
Conditional sentences
If clauses
Indirect speech

English exercises with answers.
Basic grammar rules with clear explanations and examples.