In English, each then have formula and using private but do not yet understand basic grammar knowledge so students often makes the wrong grammar. For example, When describing an action that happened before another action in the past, they often use the simple past tense, while more common than out to use the past tense. For example, the sentence ' Before he went out, he locked the door ' should be written as ' Before he went out, he had locked the door. 'In addition, the students also often confused between the recipe. For example, When he came, we were have dinner. In this sentence the verb ' have ' to be converted to ' having ' because the formula of the past persists is: was/were + V-ing.
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