English grammar turns out to be so simple. You can learn it after listening to a few jokes.

One day the teacher asked Xiao Ming: 1+1=? Xiao Ming: I don’t understand. Teacher: Go home and ask your mother. Xiao Ming asked his mother: Mom 1+1=? My mother plays mahjong: both are the same! Xiao Ming asked his father: Dad 1+1=? Dad takes a shower: It feels so good! Xiao Ming asked his brother: Brother 1+1=? Brother watching the football game: OK! One more! Xiao Ming asked my sister: Sister 1+1=? The old sister called her boyfriend: Honey, I’ll wait for you~ The next day, the teacher asked: Xiao Ming 1+1=? Xiao Ming: Both of you! The teacher slapped Xiao Ming. Xiao Ming: It’s so cool! The teacher gave Xiao Ming another slap. Xiao Ming: OK! One more! The teacher kicked Xiao Ming downstairs. Before Xiao Ming died, he said: My dear, I will wait for you~ The teacher died of shock.