omitting the infinitive "to" after a conjunction?

[dihen]

Is it incorrect to omit the infinitive "to" after a conjunction, like in these below?

"He told me to be patient and () study well."
"It is your choice to be successful or () be unsuccessful.

[rewboss]

No, it isn't incorrect, although it isn't necessary.

[dihen]

although it isn't necessary.

"Isn't necessary to omit the "to"" or "isn't necessary to leave it there"?

[RonBee]

It isn't necessary to have it there.

[kristinita]

Omitting "to" is not so common in English. Using infinitive with "to" is preferable.

[river]

Is it incorrect to omit the infinitive "to" after a conjunction, like in these below?
"He told me to be patient and () study well."
"It is your choice to be successful or () be unsuccessful.

He told me to be patient and study well. (correct)
He told me to be patient and to study well. (correct)

It is your choice to be successful or to be unsuccessful. (correct)
It is your choice to be successful or unsuccessful. (correct)

[dihen]

Is it correct to omit the "to" after the "and" here?
`
to love and not hate
to succeed and not fail

[kristinita]

No, here with "to" is much better.

[dihen]

No, here with "to" is much better.

But it's not (syntactically) ungramatical, is it?

[kristinita]

Sure. It's Ok