I'm troubling with grammar.
It's not a new idea or value but it's one that I certainly think at these times is worth building on.

What I don't understand is 'is worth building on' in the end of sentence. I can understand before it but don't know what subject of the rest one (is worth building on) is. Can anybody help me?

Question

I'm troubling with grammar.
It's not a new idea or value but it's one that I certainly think at these times is worth building on.

What I don't understand is 'is worth building on' in the end of sentence. I can understand before it but don't know what subject of the rest one (is worth building on) is. Can anybody help me?

Answer

to build on = to expand on something, to continue progress made in something
to be worth something = to be a worthy result of the effort invested.

So the idea is worthy of being built upon - that's what the sentence is saying by combining these two phrasal verbal constructions. The idea is so good that it would be a good idea to continue and do better.

Answer

showing the whole sentence may be helpful.

Answers · 2

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