In german, there are three different pronouns that are spelt "sie" (not counting capitalization changes):

• as the singular feminine nominative (she, in English)
• as the plural third-person nominative (they, in English)
• as the formal second-person singular or plural nominative, but only when capitalized (No English equivalent. Similar to the difference between "you" and "you, sir")

The conjugations in the present tense are as follows:

• -t
• -en
• -en

The forms of haben and sein for them are as follows:

• hat :: ist
• haben :: sind
• haben :: sind