When I want to say this monday, can i say ce lundi? or does it have to be le lundi?

It's le lundi.

Thank you for using the Jiskha Homework Help Forum again. "le lundi" = "on Monday." "ce" can mean "this" or "that" so you might say "ce lundi-ci" = this Monday.

Mme

When referring to days of the week in French, generally you would use "le" followed by the day of the week to signify "on." To specifically indicate "this" Monday, you can use "ce" before the day of the week. Therefore, to say "this Monday" in French, you would say "ce lundi."

However, it's important to note that the usage of "ce" or "le" can vary depending on the context or region. In some cases, "le" may also be used to refer to "this" Monday. So while "le lundi" is more commonly used to mean "on Monday," "ce lundi" is the specific phrase for "this Monday."