I can't pay my medical bills, tuition or transportation costs.
この場合、次のような言い方ができますよ。
ーI can't pay my medical bills, tuition or transportation costs.
「病院代、学費、交通費が払えない」
medical bills「病院代・診療費」
tuition「学費」
transportation costs「交通費」
I can't pay の代わりに次のようにも言えます。
ーI can't afford ...
ーI don't have money to pay ....
ご参考まで!
I can't afford to pay for the hospital, tuition, and transportation.
ご質問ありがとうございます。
・「I can't afford to pay for the hospital, tuition, and transportation.」
(意味) 病院の診察代、学費、交通費が払えない。
<例文>I can't afford to pay for the hospital, tuition, and transportation because I'm broke.
<訳>お金がないため、病院の診察代、学費、交通費が払えない。
参考になれば幸いです。