I saw the sentence like:

It can go places where people cannot.

Is this sentence grammatically right?

  • Yes, that is a grammatical construction. It can reach places that people cannot (reach). For example, a camera on a long pole can be inserted into conduit to look for problems. The camera can go places that people cannot. – Tᴚoɯɐuo Nov 24 '16 at 12:34

Users of all languages show a tendency to drop words that are not entirely necessary. English, in particular, has a great deal of redundancy.

Your example is a shortened version of this:

"It can go [to] places where people cannot [go].

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