I wanna know that,if a sentence contains "need" word then it'll be ok to use " to" in that sentence.? Example- i need to go to a doctor
.. I m having trouble with that query because i have read some rules about this
That's fine. Your sentence would not be correct without to there (in both places).
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That's fine. Your sentence would not be correct without to there (in both places).
Vani palI need to go to a doctor.
This is good. You can use "need to" the same as you use "want to".
Vani palI have read some rules about this.