13. (+) I came to Pia’s house last night because she was mad at me. / Aku datang ke rumah Pia tadi malam karena ia marah padaku.
(-) I did not come to Pia’s house last night because she was not mad at me. / Aku tidak datang ke rumah Pia tadi malam karena ia tidak marah padaku.
(?) Did you come to Pia’s house last night because she was mad at you? / Apakah kamu datang ke rumah Pia tadi malam karena ia marah padamu?
14. (+) My mother made some sandwiches just now. / Ibuku baru saja membuat sandwich.
(-) My mother did not make sandwiches. / Ibuku tidak membuat sandwich.
(?) Did your mother just make a sandwich? / Apakah ibumu baru saja membuat sandwich?