Some rules in Toefl Grammar :

1. Passive voice : be + v3

Present : am/is/are + v3

Past : was/were + v3

Present perfect :have/has/been + v3

Future and modal : will/must/can + be + V3

2. Correct sentence : S + V

eg : Johny watching tv coming here

This is a wrong sentence because that sentence only has a subject.

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