请问“有义务做“的英文

1.have the responsibility/duty to do sth.
2.be oblidged to do sth.
3.It is one's duty to do sth.

be duty bound to

Be obligated to do sth / have the responsibility to do sth.

The obligation to do

be obliged to
有义务做
看到大家都写得差不多，我写点其他合适的
be bounded to do
有义务（受约束去）做
be supposed to do
应该去做

For example: I am obligated to help her.