bangohan no ato, watashi wa haha to issho ni araimono o shimasu.

After dinner, I do the dishes together with my mother.

Breakdown of bangohan no ato, watashi wa haha to issho ni araimono o shimasu.

• は: topic particle
• 私わたし: I
• を: direct object particle
• と: companion particle

Questions & Answers about bangohan no ato, watashi wa haha to issho ni araimono o shimasu.

What does 晩ご飯のあと mean, and how does の work here?

晩ご飯のあと means after dinner.

• 晩ご飯 = dinner
• あと = after, later
• の links the two nouns

So this pattern is:

Noun + の + あと = after Noun

Examples:

• 学校のあと = after school
• 仕事のあと = after work

Here, の is acting like of or a linking marker, so 晩ご飯のあと is literally something like the after of dinner, which becomes after dinner in natural English.

Why is there a は after 私?

は marks the topic of the sentence.

So 私は means as for me or I as the topic.

In this sentence:

私は母と一緒に洗い物をします。
= As for me, I do the washing up together with my mother.

Japanese often uses は where English would just use the subject I. It does not always mean strong emphasis; it often just sets up what the sentence is about.

Why does the sentence use 母 instead of お母さん?