The document discusses the verb "can" which signifies ability or possibility. It can be used affirmatively to indicate ability, negatively to indicate inability, and interrogatively to ask about ability. Examples are provided of using "can" in the affirmative with "I/you/he/she/it/we/they + can + infinitive", in the negative with "I/you/he/she/it/we/they + can't + infinitive", and in the interrogative with "Can + I/you/he/she/it/we/they + infinitive".

1. CAN
V E R B O M O D A L Q U E S I G N I F I C A P O D E R O S A B E R .
I N D I C A H A B I L I D A D O P O S I B I L I D A D

2. CAN
(AFFIRMATIVE)
I / Y O U / H E / S H E / I T / W E / Y O U / T H E Y + C A N + I N F I N I T I V E
E X : I C A N S W I M V E R Y W E L L

3. CAN (NEGATIVE)
I / Y O U / H E / S H E / I T / W E / Y O U / T H E Y + C A N ’ T + I N F I N I T I V E
E X : I C A N ’ T S P E A K E N G L I S H W E L L

4. CAN
(INTERROGATIVE)
C A N + I / Y O U / H E / S H E / I T / W E / Y O U / T H E Y + I N F I N I T I V E ?
E X : C A N Y O U S P E A K S PA N I S H ?