•			The auxiliary can, in the infinitive form,
		is to be able to.

		Example:
		It's great to be able to speak many languages.

•			The future of the auxiliary can is will be able to.

		Example:	
		Don't worry. I'll (will) be able to pick you up.

•			The past simple of the auxiliary can is could.

		Example:
		He could be very kind sometimes.
		I couldn't hear anything because of the music.