Modal verbs such as:  "to be", "to have", "can" "must" "want to", "could", "would" are not on the word list because, the 625 List is designed to provide two things:

 1)  Extremely frequent, useful words [Modal verbs definitely fall into this category]

2)  Words that can be easily learned using pictures alone

The goal for these 625 Lists is to give users a way to learn a bunch of key vocabulary without needing to resort to translation.  Once you progress to sentences and grammar, you should already have a solid vocabulary foundation, and can better focus on grammar and abstract vocabulary.

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