Duolingo Guidebook · Japanese from English

ごりょうしんはらいしゅう日本に来ますか。
Are your parents coming to Japan next week?

はい、らいしゅう来ます。
Yes, they're coming next week.

金曜日に何をしますか。
What are you going to do on Friday?

なごやでゆうめいなしろを見ます。
We're going to see a famous castle in Nagoya.

しんかんせんは何時ですか。
What time is the bullet train?

つぎのりょこうがたのしみです。
I'm looking forward to the next trip.

In English, we say on Monday. In Japanese, you put に after days of the week to show when you do something.

月曜日に仕事へ行きます。
Getsuyōbi ni shigoto e ikimasu.
(I) go to work on Monday.

You can use also は after the day. This shows that you’re talking more about that day itself, as opposed to what you’re doing on that day.

火曜日は忙しいです。
kayōbi wa isogashī desu.
(I) am busy on Tuesday.
Literal: Tuesday is busy.

But words like あした or 今日 can’t be followed by に (ni)! Instead, use は (wa)!

おとといは友だちと話しました。
Ototoi wa tomodachi to hanashimashita.
(I) talked with my friends the day before yesterday.

Notice that in addition to と (to) meaning and, you can also use と (to) to say who you do something with!