1. 表示强调

still, indeed, apparently, oddly enough, of course, after all, significantly, interestingly, also, above all, surely, certainly, undoubtedly, in any case, anyway, above all, in fact, especially, obviously, clearly

2. 表示比较

like, similarly, likewise, in the same way, in the same manner, equally

3. 表示对比

by contrast, on the contrary, while, whereas, on the other hand, unlike, instead, but, conversely, different from, however, nevertheless, otherwise, whereas, unlike, yet, in contrast

4. 表示列举

for example, for instance, such as, take …for example, except (for), to illustrate

5. 表示时间

later, next, then, finally, at last, eventually, meanwhile, from now on, at the same time, for the time being, in the end, immediately, in the meantime, in the meanwhile, recently, soon, now and then, during, nowadays, since, lately, as soon as, afterwards, temporarily, earlier, now, after a while