The main feedback I’d like to give here is that I wish the default definition of verbs was given in the to-infinitive form. Many verbs in English can be both nouns and verbs. For example “call” can mean “a phone call” or “to communicate via phone”. AFAIK in Chinese 叫 is just a verb, so it would be more clear if the default meaning was “to call”. And in cases where the verb can be both a verb and noun, it would be cool to give both.
Also I do see that the alternative definitions are “calls, called, calling”. Personally I don’t see the point in listing out the different forms of the verb in English, when the to-infinitive form is already the well established “dictionary” form of a verb. Some other things to consider:
Even listing the to-infinitive as an alternate would be awesome, because currently I have to manually add it for every verb after cross referencing with Wiktionary.
In the lesson you could have word class details that are not expected in reviews. Ex. you could have the lesson text for 叫 be “call (verb)”, “verb: to call”, "(to) call). A lot of options here.
the previous point applies to all parts of speech, I wish I knew these details in the lesson, because right now I have to look it up for every word that’s not a noun. Especially would be nice to call out measure words.