The pinyin ai can be written with the following strokes:

The character ai is:

爱 (ài)

Here are the strokes:

1、 (㇒) a horizontal stroke
2、 (一) a horizontal stroke
3、 (ノ) a diagonal stroke
4、 (㇏) a hook stroke

Or you can also use the five strokes:

㇒一ノ丶㇏