am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?

有三心无二意

三人相聚清明后

You use a knife to slice my head and weep beside me when I am dead. What am I?

大口小口

一真有人跟着他

Pronounced as one letter,
And written with three,
Two letters there are,
And two only in me.
I'm double, I'm single,
I'm black, blue, and gray,
I'm read from both ends,
And the same either way.
What am I?

卢前王后

那个跟快，热火冷

What jumps when it walks and sits when its stands

春节第一日’

From the beginning of eterity, to the end of time and space, to the beginning of every end, end of every race.

一真在前头