[問題] “分不清楚“的英文

[pinkbox1003 (PTT鄉民人真好~)]

舉個例子來說
 because they are twins,I always can't keep them straight

我之前學的片語是keep.....straight
請問一下有沒有其它的用法呢？

譬如說：我通常分不清楚這兩個字的意思
請問該怎麼翻譯比較好呢？
謝謝^^

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◆ From: 123.252.40.144
推 newstage:也能can't make the differences between them  吧？
→ outofdejavu:or     tell
→ Leeng:用recognize會不會太拗口??
推 nonname:"tell" is great
推 rampage:U can directly put 'I can't tell them.'
→ pinkbox1003:謝謝你們哦~`