Sometimes you know a word has two forms, but you 're not sure which one is appropriate to use in the situation at hand. This happens a lot with verbs, where past-tense forms can compete for acceptance ...

Woman in red cardigan: People do get their tenses of a verb confused. Making sure that the verb is in the same tense all the way through a document or a letter or an email. If you read it to yourself ...

There are variations in the way verbs form the past tense. They can be looked at in the following way: ...