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


All 3 forms of this ver5b are the same.


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

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

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