Should students use smartphones in class? Should students use smartphones in class?

Should students use smartphones in class? Should students use smartphones in class?

Added question mark since this is a question.

Should students use smartphones in class? Should students use smartphones in class?

I think students using smartphones in class is good. I think students using smartphones in class is good.

I think students using smartphones in class is good. I think students using smartphones in class is good.

So that the next sentence flows more smoothly with the first sentence, you could also say: "I think students using smartphones in class is good for many reasons." or "I think students using smartphones in class is good in many ways."

I think students using smartphones in class is good. I think students using smartphones in class is good.

Added subject 'I' at the beginning of the sentence.

I think students using smartphones in class is good. I think students using smartphones in class is good.

First, when they research something, it is useful. (needs a comma) First, it is useful when they research something. (doesn't need a comma) First, when they research something, it is useful. (needs a comma) First, it is useful when they research something. (doesn't need a comma)

Two ways to say the same thing.

First, when they research something it is useful. First, when they research something it is useful.

While what you said is correct, a better way to phrase it might be: "First, smartphones can be useful when students have to research something."

First, when they research something, it is useful. First, when they research something, it is useful.

Added comma after 'something' to separate the dependent clause.

First, it is useful when they need to research something it is useful. First, it is useful when they need to research something.

Second, they can use the latest smartphone information. Second, they can use the latest smartphone information.

I'm not sure what you mean by smartphone information; maybe you meant smartphone features? If you say "Second, they can use the latest smartphone features", that would make sense.

Second, they can useaccess the latest smartphone information using smartphones. Second, they can access the latest information using smartphones.

Reordered words for clearer meaning and better flow.

Second, they can use the latest smartphone information. Second, they can use the latest smartphone information.