I must say that I am very much to blame.

我必须说都怪我不好。

《新英汉大辞典》

The more we try to push ourselves in the direction of forgiveness (" I must forgive them "), the more we trigger resistance in our heart, and the more we blame our-selves for it.

我们越希望宽恕他们，我们内心的反抗就越强，从而就会更加自责。

youdao

If I mess up, I must accept that and not try to put the blame on oth-ers.

如果我做得不好，我必须接受，并且不把过失推卸给别人。

youdao

Worse yet, U.S. policy-makers -- and here, I regret to say, I must assign some blame to the legislative branch as well as the executive branch -- have seized upon the perceived public's lack of concern with security policy to take steps that will greatly magnify the dangers of applying inadequate leadership, attention and resources to world affairs.

CENTERFORSECURITYPOLICY: Center For Security Policy

It takes two to tango, and I believe a fair share of the blame must be apportioned to those people who aim to bribe referees.

BBC: SPORT | Football | African | The referee's view

We must all accept the blame and, to the extent that I have contributed to the situation, I am profoundly sorry.

BBC: In full: Speaker statement to MPs