想来(xiǎng lái) - presumably, it may be assumed in Mandarin

想来 (xiǎng lái) means that having thought it over, one supposes. It marks an inference the speaker is fairly confident about but has not checked. 想来他已经知道了 is closer to he must know by now than to maybe he knows.

It opens the clause, before the subject or just after it, and it modifies the whole statement rather than any one word. The register is a shade literary, so it turns up more in writing and in careful speech than in a chat at a bus stop, where 大概 or 应该 would do the same job.

The trap is that 想 and 来 also form an ordinary verb phrase. 我想来 is I want to come, and there is nothing inferential about it. Position sorts them out: with a subject in front and no further clause, it is want to come; standing at the head of a full statement, it is presumably. 我想来看你 is I want to come and see you, while 想来你会同意 is I take it you will agree.