Ich kann Deutsch sprechen.
English: I can speak German.
Modal verbs in German are special verbs that show ability, possibility, necessity, permission, or obligation. They are used with another verb in the infinitive form.
Use modal verbs in German to talk about what you can, must, may, want, should, or would like to do. Modal verbs help you express needs, wishes, permissions, and abilities.
Ich kann Deutsch sprechen.
English: I can speak German.
Du musst heute arbeiten.
English: You must work today.
Wir dürfen hier nicht rauchen.
English: We are not allowed to smoke here.
Er möchte ein Eis essen.
English: He would like to eat an ice cream.
Ihr sollt leise sein.
English: You (plural) should be quiet.