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Are 'in,' 'alert,' 'call,' and 'help make' correctly used in the sentences?

1. Dennis spoke with a melodious and well-modulated voice, which is essential in communicating with students and in building rapport with them.
2. Mrs. Duncan, the teacher, was alert enough to call two latecomers to introduce themselves and tell about their expectations of her (as their new teacher).
3. The speaker forgot to mention some significant words that would help make the guidelines in choosing a research topic more comprehensible.

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You need to simplify your sentences. By complicating them unnecessarily, you run the risk of making mistakes and rendering your sentences unnatural. Note that "tell about" doesn't work. The verb "tell" is mostly transitive.

Comments  

I've just made the following revisions, teechr, Are the sentences acceptable now?

1. Dennis spoke with a melodious and well-modulated voice so that he could communicating with students better and build rapport with them easily.
2. Mrs. Duncan, the new teacher, was alert enough to call on two latecomers. She asked them to introduce themselves and tell their expectations of her.
3. The speaker forgot to mention some significant words that would help clarify the guidelines in choosing a research topic.