= This phrase =
もう少しゆっくり話してくれませんか?
Moo sukoshi yukkuri hanashite kure masenka?
(Could you speak more slowly?)
もう少しゆっくり話してくれませんか?
Moo sukoshi yukkuri hanashite kure masenka?
(Could you speak more slowly?)

トム
もう少しゆっくり話してくれませんか?
Moo sukoshi yukkuri hanashite kure masenka?
— Could you speak more slowly?
casual expression (family,friend)
■もう少しゆっくり話して。
Moo sukoshi yukkuri hanashite.
— Speak more slowly.
Moo sukoshi yukkuri hanashite.
— Speak more slowly.
■もう少しゆっくり話してくれる?
Moo sukoshi yukkuri hanashite kureru?
— Can you speak more slowly?
Moo sukoshi yukkuri hanashite kureru?
— Can you speak more slowly?
polite expression
■もう少しゆっくり話してください。
Moo sukoshi yukkuri hanashite kudasai.
— Please speak more slowly.
Moo sukoshi yukkuri hanashite kudasai.
— Please speak more slowly.
■もう少しゆっくり話してくれませんか?
Moo sukoshi yukkuri hanashite kure masenka?
— Could you speak more slowly?
Moo sukoshi yukkuri hanashite kure masenka?
— Could you speak more slowly?
■もう少しゆっくり話していただけませんか。
Moo sukoshi yukkuri hanashite itadake masen ka?
— Could you speak more slowly, please?
Moo sukoshi yukkuri hanashite itadake masen ka?
— Could you speak more slowly, please?
other expressions
ごめんなさい。気をつけます。
ふじこ
Gomennasai.
Ki o tsuke masu.
— I’m sorry. I will be careful.