I tend to make mistakes in the use of grammatical tenses when I speak.
I confuse grammatical tenses when I'm speaking.
I'm not very good at grammatical tenses, so please let me know if I'm wrong.
「私は話していると時制が一致しなくなります」は ”I tend to make mistakes in the use of grammatical tenses when I speak"です。
お願いしたい時に ”I'm not very good at grammatical tenses, so please let me know if I am wrong” また ”I'm not very good at grammatical tenses, could you please let me know if I'm making mistakes?"を使えます。
時制 = grammatical tenses
例文:
-Some people mix different grammatical tenses when they talk in other languages.
(彼らは他の言語で話すとき、時制を混ぜます。)