Learn English – Usage of ‘into’ after ‘penetrate’

grammarprepositional-phrases

Somehow I have difficulties telling which one is more correct

They penetrate into the building OR They penetrate the building

I've heard it being used both ways and I'd like to hear some thoughts on that.

Thanks.

Best Answer

Penetrate means to pierce or pass into or through. If you are going to use into after penetrate, it would be redundant.

The bullet penetrated the wall. The fog lights penetrated the mist.

By substitution, if you used into after penetrate, it would be:

The bullet pierced into into the wall. The fog lights passed into into the mist.

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