SMT-past simple vs past perfect and continuous forms

SMT-past simple vs past perfect and continuous forms
SMT-past simple vs past perfect and continuous forms
SMT-past simple vs past perfect and continuous forms
SMT-past simple vs past perfect and continuous forms
SMT-past simple vs past perfect and continuous forms
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คำแนะนำของผู้เขียน

The student is challenged to think through the examples and pictures to make the right decisions by clicking, writing (ungraded), or dragging and dropping