Grade 4 Grammar Lesson 18 The present tense

When do we use the simple present tense?
What is the structure of simple present tense?
When do we use the present continuous tense?
What is the structure of present continuous tense?
When do we use the present perfect tense?
What is the structure of present perfect tense?
When do we use the present perfect continuous tense?
What is the structure of present perfect continuous tense?

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