The brain can't / isn't able to live more than six minutes without oxygen.
isn't able to
Scientists think eating seafood might be able to / might /can reduce dementia by 30%.
might be able to
Everyone has four to seven dreams each night, but some people can / can't remember their dreams.
can't
In the future, the Japanese think they can / will be able to show people's dreams on film.
will be able to
It's not necessary to buy the course book. You _________ buy the coursebook.
don't have to
It's important to be in class by 10.00 a.m. We _________ be in class by 10.00 a.m.
must
It's OK to check vocabulary using your mobile phone. You _________ check vocabulary using your mobile phone.
can
Don't speak in your own language. Use English! We _ ________ speak in our own language. We _________ use English.
mustn't/ must
You decide if you want to bring a dictionary to class. It's not obligatory. You _________ bring a dictionary to class.
don't have to
fixing decisions / things
things
taking care of children / events
care of children
giving directions / children
directions
organizing jokes / events
events
did / you / sorry/ what/ say?
Sorry, what did you say?
