✔ 最佳答案
1.It is no doubt that s.v.o. (1,2,3 are ALL CORRECT)
or
2.There is no doubt that s.v.o.
3) There could be no doubt that ( past tense)
is and be <----------are called " helping verbs" in English.
" no doubt" is an English phrase.片語
No doubt he didn't need me. ( you can place it in front of a sentence)
OR
place this phrase right after the helping verb
It is<------helping verb no doubt that ................
One more example for you
No longer<-------------------不再 ( phrase )
- I am<---------helping verb no longer a kid. <----------------------- I am not a kid anymore(adverb).
I am no longer a kid. = I am not a kid anymore(adverb).