question words

1. WH-question
Where	à ask about places.	Where is he? At home.
When	à ask about times and dates.	When will you phone? At 6 o'clock
Why	à ask about a reason.	Why are they leaving? They are tired.
How	à ask in what way.	How will she get here? By taxi.
Who	à ask about people	Who are you going to visit? My sister.
What	à ask about things (many possible answers).	What's your father's job? He's a dentist.
Which	à ask about things (small number of possible answers).	Which finger did you break? My ring finger.
2. Word order
Most wh-questions begin with a question word + an auxiliary verb + the subject
Question word Auxiliary Subject Verb     What is Brian doing?     Where have you put the book?   When can we travel safely?   How does the radio work?
3. Prepositions with wh-questions
Prepositions (to, about, with, from, ...) usually go at the end. Here are some examples: - Where are you from? - Who do these books belong to? - What are you talking about? - Who are you going with?

imperative

1. Form

Infinitive without to It has the same form in singular and plural.

2. Use

Orders Sit down, boys and girls. Try another pen. Instructions Go straight on. Add sugar to the milk and flour. Warnings Look out! Mind the step! Negative Imperatives (Prohibitions) Do not walk on the grass. Don't cycle here.

difference 1

Use: present simple	Use: present continuous
Repeated actions and habits. Britney Spears sings songs.	Something happening now. Tim is singing a song.
Actions happening over a long period of time. The turtle lives in its house.	Actions happening over a short period of time. He is staying in a tent this holiday.
We use the present simple with verbs of thoughts, feelings or states. The pig thinks about its future. The hedgehog loves the cactus. The moon goes round the earth.