も

私(わたし)も行(い)きます。

Watashi mo ikimasu.

I'll go too.

Joining someone else's plan

コーヒーもお茶(ちゃ)もあります。

Kōhī mo ocha mo arimasu.

We have both coffee and tea.

も…も means both — offering a guest a choice

昨日(きのう)も今日(きょう)も雨(あめ)です。

Kinō mo kyō mo ame desu.

It rained yesterday and it's raining today.

Grumbling about a run of weather