Grammar
Was/were – past simple of ‘be’
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The simple past tense of the verb to be: This page will present the simple past tense of the verb to be: its form and its use. The affirmative form
Grammar
The imperative – Sit down! Don’t talk!
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Form of the imperative The imperative form is the same as the bare infinitive. It has only one form for both second person singular and plural 
Grammar
Present simple or present continuous?
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What’s the difference?Present Simple and Present Continuous Present Simple Present Continuous Things which are always true:–
Grammar
Present continuous – I’m doing, I’m not doing, Are you doing?
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The Present Continuous / Progressive John is in his car. He is in his way to work. He is driving to workThis means he 
Grammar
Сan, can’t – ability, possibility, permission
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Can, can’t – form Infinitive without to  We use can + infinitive without to. I can swim. (NOT I can to swim.) We can’t come. 
Grammar
At, in, on – prepositions of place
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Prepositions of place Preposition of place Explanation Example in – inside I watch TV in the living-room. I live in New York. Look at the picture in the book.
Grammar
At, in, on – prepositions of time
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Prepositions of time Preposition of time Explanations Example on – days– weekend (American English) Many shops don’t open on Sundays.
Grammar
Whose, possessive ‘s
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Possessive Nouns A possessive noun is a noun indicating ownership (or possession) by ending ‘s or just an apostrophe. Examples of Possessive
Grammar
Object pronouns vs subject pronouns – me or I, she or her?
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Object pronouns vs subject pronouns Subject pronouns Subject –before the verb Subject pronouns are the subject of a verb. They go before the verb.
Grammar
Adverbs of frequency with present simple
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What are adverbs of frequency? We use adverbs of frequency to say how often we do something. Adverbs of frequency are often used with the present simple because