Complete each sentence with can or can't + the verb in brackets. Use a form of be able to if can/can't is not possible.
I
a That shelf is too high. I (reach) can't reach
it.
b What's that noise? I (hear)
something.
c There's something wrong with this door. I (open)
it.
d I'm really hungry! I (take)
my lunch break yet.
e Sorry, I (come)
tomorrow. I'll try and see you next week.
f I really want (use)
a computer properly.
g Don't push Harry in the water. He (swim)
co
h I feel terrible. I (sleep)
for the past couple of night:​

a. That shelf is too high. I can’t reach it.

b. What’s that noise? I can hear something.

c. There’s something wrong with this door. I can’t open it.

d. I’m really hungry! I haven’t been able to take my lunch break yet.

e. Sorry, I can’t come tomorrow. I’ll try and see you next week.

f. I really want to be able to use a computer properly.

g. Don’t push Harry in the water. He can’t swim.

h. I feel terrible. I haven’t been able to sleep for the past couple of night.

Правило: модальный глагол can имеет только две формы – простого настоящего/Present Simple (can) и простого времени. В остальных случаях – например, простого будущего/Future Simple (как в предложении f) или совершенного настоящего/Present Perfect (как в предложениях d и h), а также в других употребляют выражение to be able to.