When I write to you in Japanese I'll write to you in English as well which is good practice for me.
When I write to you I'll write in Japanese and English that way I can practice my English too.
1) When I write to you in Japanese I'll write to you in English as well which is good practice for me.
「日本語で手紙を書く時、良い練習になるから英語でも書くね。」
2) When I write to you I'll write in Japanese and English that way I can practice my English too.
「あなたに手紙を書く時は日本語と英語の両方で書くね。そうすれば私の英語の練習にもなるから。」
ご参考になれば幸いです!