There are no main "yo" verbs in Spanish. Like if you said "yo
voy" it means i go. or if you said "yo juego" it means to play. All
Spanish verbs have a yo form which means your saying you are doing
something. there are no main yo verbs.
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Regular Verbs
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It is not used with the verbs tener, ser, and estar.
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Yes, you do. However, in Spanish you can drop the subject
whereas French tends to keep them.