Play a part

I'd like to play a part in the initial design.

The roads were foggy during the accident but alcohol may have also played a part.

Exercise played a major part in his weight loss.

My decision to leave home at the age of sixteen played a big part in my personal development.

Pack ice, at times mounting to a height of 35 ft., snow, fog, and floating mines all played their part in the disorganisation of railway services, and most of the train ferry services were completely suspended for a month or more; [...].