A. "He sang Happy Birthday" is the correct form. This is one of the irregular verbs, and they are notorious for causing problems.
The three principal parts of this verb are sing/ sang/ sung. The second spelling is used for simple past time: "My mother sang me to sleep each night." As a pure verb, the third spelling is used only with the helping verbs have/ has/ had:
- "I have sung my last song."
- "She has sung the National Anthem countless times."
- "Before she had sung the last note, the crowd erupted in applause."
The forms are not always predictable. We have swim/swam/swum, but it’s swing/swung/swung. There is no swang.
If you get confused, help is near:
http://www2.gsu.edu/~wwwesl/egw/verbs.htm
http://www.englishpage.com/irregularverbs/irregularverbs.html
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