はもとより

はもとより is a formal expression meaning "not only… but also" or "let alone". It is used to state that something is obvious or goes without saying, and then to add that something else is also true. The item before はもとより is presented as a given – something naturally expected – and the item after it extends the scope to something additional or even more noteworthy.

This grammar point is composed of the topic particle は, plus もとより (meaning "from the start" or "of course"). It is a more formal synonym of はもちろん.

Basic usage

The pattern typically follows this structure: A はもとより B も – meaning "not only A but also B" or "A goes without saying, and B as well."

The nuance is that A is already expected or obvious, and B is highlighted as something beyond that expectation.

Formal tone

はもとより is primarily used in written language, formal speeches, and news reports. In everyday conversation, はもちろん is much more natural.

Common particles after the second item

The second item is often followed by も (also) or まで (even), emphasizing the extent or inclusiveness.