Have to / Have got to

In American English we can use "I have to go", whereas in British English the form "I have got to go" is more common.

In spoken English, specially in American English, these forms are also possible:

• I gotta go now
• you gotta go now
• He's/She's gotta go
• It's gotta go
• We gotta go now
• Thew gotta go now

Note that the form is different with he/she/it, and it's not normally used in written English.

More expressions which are frequently used in informal speech are:

• gotta = go to
• gonna = going to
• wanna = want to