Grammar Summary
1. In active sentences, the agent is in subject position. In passive sentences, the receiver is in the subject position.
2. Passive sentences often do not mention the doer of action.
3. A gerund can function as the subject of a sentence. A gerund can be replace by the pronoun it.
4. When an unreal conditional if-clause contain the verb be, use were for all subjects.
5. When you use a past wish sentence, you express regret or dissatisfaction about a past situation.
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