The Gerund and the Infinitive after Aspect Verbs

Aspect Verb + the Gerund	Aspect Verb + the Infinitive
1. to begin doing sth– used to indicate an activity or process: e.g. He began working at the report.	to begin to do sth – used to indicate a state of mind or mental activity: e.g. Greg began to realize that he had hurt her feelings.
2. to start / to begin doing sth – the Gerund is used after non-Continuous forms of verb: e.g. It has just started raining.	to start / to begin to do sth – the Infinitive is used after Continuous forms of verb: e.g. It’s beginning to snow.