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communication-english-logo, By Carmen Diaz - Coggle Diagram
Modal Auxiliary Verbs (Present) 
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The basic structure is:
- negative: subject + auxiliary verb + not + main verb
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- positive: subject + auxiliary verb + main verb
Modal Auxiliary Verbs (Past)
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Ability
I could run fast, No I am old
Certainty
He musthave been rich. He had a big house and an expensive car. He can´t have written that poem. He was literate
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Modal Auxiliary Verbs (Future)
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Using “to” unnecessarily
INCORRECT:They going to meet us at the theater. He should to eat his dinner. I had better to go now. You must not to use that pencil
CORRECT:They are going to meet us at the theater. He should eat his dinner. I had better go now. You must not use that pencil.
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Using double modals:
You should ought to speak English. She might can help me. You ought to speak English. /should speak She might be able to help me.
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Preposition of Time (at, in, on, etc.)
in for month, years, centuries and long periods.
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