He mixed coffee and milk.

I like solving Tsumego problems.

We need to combine these data.

We have a responsibility to protect this world.

Ex post facto laws pose a problem for a fair legal system.

I am studying Thai language.

I have started learning Malay language.

He is good at speaking Turkish.

I am thinking of wanting to learn Mongolian language.

Acronyms are a convenient way to convey information briefly.