In addition, they allow the readers to transition from one topic or point to another. They enhance the understandability and logical organization of an article by helping the readers know the relationship of the previous and following sentence and/or paragraph in the paper they are reading.
http://essaytransitionwords.org/compare-and-contrast/
Please explain to me the grammatical form and function of "know" here especially the tense as I was expecting "to know" form instead of "know" while reading? Are there any rules or signal word to suggest that "know" should be used and not any other grammatical forms in the context?
Know is a plain infinitive, a present infinitive, to be exact. To know could just as well have been used instead of know. Both infinitive forms are correct after an active form of help: I helped him [to] do it.
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Know is a plain infinitive, a present infinitive, to be exact. To know could just as well have been used instead of know. Both infinitive forms are correct after an active form of help:
I helped him [to] do it.
After help in the passive voice, to must be used: He wa