Choose the correct options

1. We use
   ["can"|"must"|"to be able to"|"have to"]
   to show rules, laws and prohibitions.
2. We use
   ["can"|"must"|"will be able to"|"have to"]
   to show that we can do sth in the future.
3. We use
   ["can"|"must"|"could"|"to be able to"]
   to show that someone has the ability to do sth, but they don't in fact do it.
4. The modal verb "can/can't" doesn't have
   [present|future|past]
   tense of usage.
5. We use
   ["can"|"may"|"to be able to"]
   to show that we are aware of something through one of our senses.
6. We use
   ["have to"|"can"|"should"|"must"]
   to express general obligations.
7. We use
   ["have to"|"can"|"should"|"must"]
   to express specific obligations.