Present perfect simple or Simple past?

Present perfect simple or Simple past?
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คำแนะนำของผู้เขียน

Present perfect or simple past?

สำรวจแผ่นงาน

Relative pronouns/it clauses + adverbial clauses with when

Grammar - ESL

Relative pronouns/it clauses + adverbial clauses with when 

Past forms

Grammar - ESL

Do the exercises!

Past Perfect /Past Perfect Continuous

Grammar - ESL

Do the exercise!

Homework lesson 8

Grammar - ESL

Read the tasks!