这个句子有没问题？？

Can you tell me if that is true?
宾语从句要有引导词

都没人敢说， 我说吧
Can you tell me is that true?
这句是错的

加个逗号或问号 就对了
Can you tell me，is that true?
Can you tell me ？ is that true?

明白吗

宾语从句关键是要用陈述语序,至于引导词可有可无.

你的句子可以改写为:

Can you tell me(that) whether/if that is true ?

Can you tell me if that is true

can you tell me if that is true?这样的句子才算正常 楼上一样也对

Can you tell me if/whether that is true?