?很难说

... It's essential。这是必要的。 It's hard to say。很难说。 It's incredible。令人难以置信/不可思议。 ...

?这很难说

... It's better than nothing. 总比没有好。 It's hard to say. 这很难说 It's incredible. 令人难以置信／不可思议。 ...

?很难去说

... IT'S HARD TO SAY ? 很难去说 cause this would be the first thing to ask ? 这将要求的第一件事的原因 the pay from ? 付费 ...