Question

What is the past tense and past participle of "cast"? For example: Substances can be (cast) to develop new materials,

Answer 1

All 3 forms of this ver5b are the same.

Explanation:

The verb "cast" has the same forms in infinitive, Past Simple and Past Participle. Other such verbs can be for example: cost, hurt, cut.

So the correct sentence is: Substances can be cast to develop new materials.