Most students don't like exams. Many teachers think they are useful. (whereas)
Most students don't like exams, whereas many teachers think they are useful.
I like trying out new things. I don't always like the things I try. (although)
I like trying out new things, although I don't always like the things I try. / Although I don't always like the things I try, I like trying out new things.
I find Math and Science really easy. Subjects like Literature and English are difficult for me. (in contrast)
I find Math and Science really easy. In contrast, subjects like Literature and English are difficult for me.
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