Can Or Could, Relatives Clauses

Question 1

Can

Answer 1

Ability in present

Permission

General possibility

Question 2

Could

Answer 2

Ability in the past

Suggestion

Possibility

Question 3

It

Answer 3

When we do not want to emphasize

Question 4

That

Answer 4

Refer a reason

Conditionals

Drawing attention to the thing mentioned

Question 5

This

Answer 5

When we refer to the second of two things mentioned In the previous sentences

When we still have something more to say about the things we are referring to

Question 6

Present Perfect

Answer 6

Have/Has + Verb in Past Participle

Question 7

Past Perfect

Answer 7

Had + Verb in past participle

Question 8

We use Past Simple when

Answer 8

We have; Ago, last week, in 2006, in January

Telling things which started and finished in the past

Question 9

Present Perfect

Answer 9

Since, in the last year, three weeks, this morning, year

Question 10

Defining Relatives Clauses

Answer 10

No commas

Who, Which, Whose, Where, When, Why

That can be used instead of who and which

Question 11

Non Defining Relative Clauses

Answer 11

Use commas

No that

Question 12

Co-Ordinating Relative Clauses

Answer 12

Always follow a comma and use which