Put the verbs into correct tense (help me, I so confused at it)

[Duc]

Hello,
Put the verbs into correct tense:
The poor bird.....(not fly) because it ....(have) a .....(break) wing.
In the second and third blanks I used the correct tense but in the first blank I thinked it must have been ''Could not have flied'' but the answer is ''would not''
Please explain it to me.
Many thanks.
_________________
Don't see your shade think you are great

[Mister Micawber]

.
'Would' is wrong. The sentence should read:

'The poor bird could/can not fly because it had/has a broken wing.'
.
_________________
Canadian-American native speaker
who teaches English for a living at Mister Micawber's
ESL cafe: Interview with Mr. Micawber

[Duc]

So is ''could not have flied'' acceptable?
_________________
Don't see your shade think you are great

[Molly]

[Mister Micawber]

.

[Nanucbe]

In the second and third blanks I used the correct tense but in the first blank I thinked it must have been ''Could not have flied''
Good. You better revise your understanding of simple verb forms before this.

Your query "So is ''could not have flied'' acceptable?" is strange.

First learn the twenty basic forms in which verbs can be used , along with the past and past participle forms of verbs. That will help you write good English.
I prefer:
The bird could not fly because it had broken wings.
'Think' thought' and 'thought'.
'Fly' 'Flew' and 'flown'.
n