あとでafter; later
あとで is "after": 食べたあとで, after eating. By itself it is "later": あとで電話します, I'll call you later.
after a noun
I will have a meal with a friend after work.
After doing
Verb in the た-form + あとで
食べたあとで, 行ったあとで. Always the た-form, even when the sentence is about the future.
After a noun
Noun + の + あとで
授業のあとで, 食事のあとで.
Later
あとで
Nothing in front. Also written 後で.
After doing something
The half with あとで happens first. The rest comes at some time after it, soon or not.
After I read this book, I will lend it to my younger brother.
Let's go out after the rain stops.
The first half can have its own subject, marked with が.
Always the た-form
The thing before あとで is already done when the other one happens. So its verb is in the た-form, even in a sentence about the future.
I will play a game after I finish my homework.
Not said: 宿題が
(I will play a game after I finish my homework.)
前に, "before", is the other way around.
I wash my hands before eating.
Before: the meal is still ahead. Dictionary form.
I brush my teeth after eating.
After: the meal is over. た-form.
After a noun
A noun needs の. A verb never takes it.
May I ask the teacher a question after class?
Later
With nothing in front, あとで is "later": not now, but before long.
Do you have a moment now?
Sorry, would later be all right?
See you later.
Said when you really will meet again soon, usually the same day. A general goodbye is じゃ、また.
後で, but 三日後
後で is this word in kanji. After an amount of time the same kanji is read ご: 三日後, three days later.
I'll come back in an hour.
あとで or てから?
Both are "after", and often either will do. てから lines the two up: first this, then that. あとで says when: at some time after.
I eat first, and then take my medicine.
The order: the meal comes first.
I take my medicine after eating.
The time: at some point after the meal.
"Since" is only てから. Only あとで follows a noun (仕事のあとで) or stands alone as "later" (あとで電話します).
Close neighbours
てからN5
"After doing", with the order in plain view. It is also "since".
It has been three years since I came to Japan.
前にN5
"Before", and after an amount of time "ago". A verb before it is in the dictionary form.
I had lunch an hour ago.
たらN4
"When" or "once": the first thing happening is the cue for the second.
Please call when you arrive at the station.
あとN4
Before an amount, あと says how much is left: あと五分で is "in five minutes", not "later". At the start of a sentence it is "oh, and".
I'll be there in five minutes.
Check yourself
1Which one fits?
明日、
Choose an answer to see why.
2Which one fits?
映画
Choose an answer to see why.
3Which one fits?
結婚
Choose an answer to see why.
More detail
Without で
After a verb or a noun you will also hear あと with no で.
I took a short walk after eating.
More sentences
After watching the movie, we talked about our impressions.
After the meal, I took a walk in the park.
I'll read this book later.