English Grammar Rules, Tenses and Key Usage
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English Grammar: Key Forms and Rules
To-Be: to be (be). To-Have: to have (have). Can: ability / power. Must: duty, obligation; deduction + infinitive. May: permission / possibility.
Pronouns, Quantifiers and Demonstratives
Few / Many: e.g., accountants. Little / Much: countless.
Since: from about 1970. For: duration, e.g., for 3 hours (period).
Some: used in affirmative sentences. Any: used in negative and interrogative sentences (but not in affirmative: I have no money).
This: this (singular). These: these (plural). That: that (singular). Those: those (plural).
Auxiliaries and Do/Does/Did
Do / Does / Did: form the auxiliary for negatives and questions. The main verb appears in the base form (infinitive without to).
Articles
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