你不来，岂不是太可惜了？
nǐ bù lái ， qǐbùshì tài kěxī le ？
If you don't come, wouldn't that be a pity?
这样做岂不是更麻烦？
zhèyàng zuò qǐbùshì gèng máfan ？
Wouldn't doing it this way be even more trouble?
他现在走，岂不是白来了？
tā xiànzài zǒu ， qǐbùshì bái lái le ？
If he leaves now, won't he have come for nothing?