Question

What are the past tense and past participle of “cast”? For example, Substances can be (cast) to develop new materials.

Answer 1

Hint:
i) The past tense is a verb tense that refers to a past event or state of being. For instance, I dove into the lake.
ii) A past participle is a word that is formed from a verb and ends with "-ed," "-d," "-t," "-en," or "-n." It can be used as an adjective or to shape verb tense.

Complete answer:
The past tense is used in English when discussing the past, assumptions (when we imagine something), and politeness. The past tense is a grammatical tense that refers to something that happened in the past. Past tense verbs include the English verbs sang, went, and washed.

The past participle is a type of a verb that usually ends in -ed and is used to form perfect and passive tenses as well as an adjective. Example: He finally finished his project. Infinitive, Past Simple, and Past Participle forms of the verb "cast" are all the same. They are referred to as ‘cast’ only. Cost, hurt, and cut are some examples of such verbs which remain the same.

As a result, the correct sentence is ‘Substances can be cast to develop new materials.

Note:
i) The past participle is a verb form used in the past and present perfect tenses, whereas the past tense is a tense.
ii) In the past participle, there is no tense. It's a verb form that isn't self-contained. An auxiliary verb, such as "have" or "had," is required. As a result, the past participle is often used in compound verbs.
iii) Remember that in older versions of English the past tense of cast was casted.