1）I have two elder sisters.
主语：I；谓语：have；宾语：two elder sisters." elder "是修饰宾语的定语
2) They don't swim very well.
主语：they ；谓语：don't swim.因为swim是不及物动词,没有宾语.Very well是补语,表示游得怎样.
3) Do you go to school every day?（你每天去上学吗?）
主语：you; 谓语：Do…go,这边表示普通疑问句,do提前.to school目的状语；every day是时间状语.
4) I really want a cup of tea.（我真的想要一杯茶.）
主语：I；谓语：want；宾语：a cup of tea.really是副词,谓语的状语.
5) Miss Smith teaches English very well.（史密斯先生教英语非常好.）
主语：Miss Smith；谓语：teaches；宾语：English；very well同样是补语.