Obligation and Permissions

Remember we use ''can'' and ''be able to'' to talk about ability or possibility.

''I can/am able to do what I like at work''

''be supposed to'' is to day what people expect you to do

''I am supposed to teach you all English''

''can'' and ''be allowed to'' means I have permission to do something.

''I can't use bad words in class but I am allowed to use a little Polish.''

''must'' and ''have to'' is used to say I have no choice.

''I must/have to start work at 4 oçlock'' 

''ought to'' and ''should'' are used to give advice

''You should/ought to go to bed early if you have an important meeting the next day''
We use ''mustn't'' to say something is not allowed

''You mustn't smoke in the school''

but ''don't have to'' to say you have a choice

''You don't have to dress smart for lesson'' (but you can if you want!)

Remember all these expressions are followed by the infinitive form of the verb.

Be used to and get used to

We use ''be used to'' when we talk about something which was strange or difficult for us in the past but is now not a problem.

Bob is used to living in Poland now but it was difficult at first.

We use ''get used to'' when we are talking about the process of change from something strange or difficult for us to something which isn't.

Bob will never get used to Polish grammar!

Bob is getting used to driving on the 'wrong' side of the road.

We use either a noun or a verb+ing after be/get used to. This is the main exception to using the infinitive form of a verb after ''to''.

Verb Patterns - verb + to/ verb + verb-ing

Some verbs are followed by the 2nd verb with a gerund (-ing form), some verbs are followed by to + infinitive (to + 1st form) and some can be followed by both!

Many verbs of preference - love, like, hate and others such as begin and prefer - can be followed by both with no change of meaning.

I like eating chocolate
I like to eat chocolate

Other verbs of preference - including enjoy, detest and others - have to be followed by a gerund (verb-ing)

I can't stand losing you ( A song by the Police - youtube it!)

Yet more different verbs - including refuse, hope, promise = must be followed by to + infinitive (to + 1st form)

I refuse to let you go home early

Stop, remember and try can be followed by either a gerund or an infinitive but the meanings are different - this is  the part which caused problems!

Stop + verb-ing means to stop doing an action

I stopped drinking my coffee.

Stop + to + 1st form  means that you stop  doing one thing in order to do another

I was drinking my coffee when I stopped to eat my chocolate

Remember + verb-ing - means you remember the action itself

I remember drinking my tea, it was nice and hot and tasted wonderful

Remember + to + 1st form means that you did not forget to do it

I remembered to drink my tea this morning, yesterday I didn't and it got cold!

Try + to + 1st form means to try something but not be successful

I tried to open the window but I couldn't as it was stuck.

 Try + verb-ing means to try something as an experiment to see what will happen.