Affirmative | Subject + to be + base + ing | She is talking. |
Negative | Subject + to be + not + base + ing | She is not (isn’t) talking. |
Interrogative | to be + subject + base + ing | Is she talking? |
Exception:
Senses / Perception to feel* to hear to see* to smell to taste | Measurement to contain to cost to hold to measure to weigh | Mental states to forget to imagine to know to mean to notice to recognise to remember to understand |
Opinion to assume to believe to consider to doubt to feel (= to think) to find (= to consider) to suppose to think* | Emotions / desires to envy to dislike to hope to like to mind to prefer to regret to want to wish | Others to look (=resemble) to seem to be (in most cases) to have (when it means to possess)* |