Here's why:

* Hydrogen Bonding Requirements: Hydrogen bonds form between a hydrogen atom covalently bonded to a highly electronegative atom (like oxygen, nitrogen, or fluorine) and a lone pair of electrons on another electronegative atom.

* Methylamine Structure: Methylamine has a nitrogen atom with a lone pair of electrons and a hydrogen atom bonded to the nitrogen.

* Hydrogen Bonding in Methylamine: The nitrogen atom in methylamine can act as both a hydrogen bond acceptor (using its lone pair) and a hydrogen bond donor (using its N-H bond).

Therefore, methylamine can form hydrogen bonds with other methylamine molecules or with other molecules containing electronegative atoms like oxygen or nitrogen.