the use of "need"

[vkhu]

Sometimes "need" can be use as a model verb, which mean it will be followed by a V-ing. However, there are cases when it will be followed by just a regular verb. Can anyone tell me when to use which? A few examples would be nice.

[Barb_D]

I'd say it's more likely to be followed by a "to Verb."

I need to see the dentist.
You need to get your car fixed.
We need to ask Mom before we say yes.
They need to get their furnace fixed.