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Make a mind map to tell the differences of the three tenses.
一般现在时态
一般过去时态
现在完成时态
Base
Promotion
Challenge
Hero
If ：
1. I will go for a picnic if it doesn't rain.
2. You must see the doctor if you are ill.
3. Finish your homework carefully if you want to pass the exam.
when, as soon as, as, until 引导时间状语从句时，也有“主将从现”的情况出现。
Describe an activity with 3 tenses.
Hero
1. I enter the English competition every year.
2. I entered the English competition in May.
3. So far I have entered the English competition three times.
Homework:
Write a composition according to your sentences ( about 80 words)