2014-09-09 Structure: modals for obligation

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http://www.pastebin.com/u/gmalivuk
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CEG GUEST - Pencil87 (wifi)
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MODALS:

would	will
could	can
should	(shall)
might	may
must
ought to
had better

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"similar expressions" (similar meanings but different grammar)

be going to
be supposed to
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p. 50 reading
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p. 65 exercise 9 - should you do these things in your country?

http://waitbutwhy.com/2014/04/everything-dont-know-tipping.html
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You don't have to do it. = it's totally your choice
You must not do it. = You can't do it. It's not a choice.

You had better study tonight, or you'll fail tomorrow's test.
= If you don't follow the advice, something bad will happen.

You have to slow down. = the speed limit is slower
You'd better slow down. = this speed is dangerous here and now
You should slow down. = this speed is generally a bit unsafe

have to / must = there's a rule about it
had better = maybe no rule, but there is a consequence

You should watch movies in English. = it's a good idea
You shouldn't talk to your friends in your native language.
= it's not a good idea (if you want to improve your English)

You should have studied last night (but you didn't).
= It was a good idea.

You're supposed to be home by 10. = your parents expect it
It's not supposed to rain today. = forecasters don't expect it
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Homework: p. 56-59 exercises 1 and 2