Is this sentence correct? "She needs to buy a car, it would be very helpful to her."?

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Please, help me

Answer 1

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No, it's incorrect because it's a run-on sentence.  

Say instead:  She needs to buy a car; it would be very helpful to her.  

Or:  She needs to buy a car because it would be very helpful to her.

fyi:  "needs to + infinitive" is a folk expression not necessarily involving "need."

She should buy a car because having one would be very helpful.  

Answer 2

I agree with Bluebellbbk.

A more succinct version would be, "It would help her a lot if she were to buy a car."

Answer 3

In fact it's two sentences. Each of them can stand alone as an independent clause.As you can't join two sentences with a comma, you'll have to decide whether to separate them completely, or connect them with a semi-colon.

She needs to buy a car. It would be very helpful to her.orShe needs to buy a car; it would be very helpful to her.