The document is from an English grammar textbook called "English Alive! Student's Book 4". It contains information about modal verbs including can, could, have to, must and their affirmative and negative forms. Tables are included that students are asked to complete with the forms of these modal verbs in both the affirmative and negative. The document contains repetitions of these tables to reinforce the grammar concepts for students.

1. English Alive!
Student’s Book 4
Whiteboard Presentation

2. English Alive!
Student’s Book 4
Grammar Ability and obligation:
can , could , have to
Complete the table with the
affirmative and negative forms
of can, could and have to.
Affirmative Negative
Present
Past
Present
Past
can
could
can’t
couldn’t
has to / have to
had to
doesn’t have to / don’t have to
didn’t have to

3. English Alive!
Student’s Book 4
Grammar Ability and obligation:
can , could , have to
Can you remember?
Affirmative Negative
Present
Past
Present
Past
can
could
can’t
couldn’t
has to / have to
had to
doesn’t have to / don’t have to
didn’t have to

4. English Alive!
Student’s Book 4
Grammar must and have to
Complete the table with the
affirmative and negative forms
of must and have to.
Affirmative
Obligation
Obligation
Negative
Obligation
Optional, no obligation
must
has to / have to
mustn’t
doesn’t have to / don’t have to

5. English Alive!
Student’s Book 4
Grammar must and have to
Can you remember?
Affirmative
Obligation
Obligation
Negative
Obligation
Optional, no obligation
must
has to / have to
mustn’t
doesn’t have to / don’t have to

6. English Alive!
Student’s Book 4
Grammar must and have to
Can you remember?
Affirmative
Obligation
Obligation
Negative
Obligation
Optional, no obligation
must
has to / have to
mustn’t
doesn’t have to / don’t have to