All modal verbs are auxiliary verbs, which means they can only be used with a main verb. Modal verbs cannot be a main verb. They are used to express ideas such as possibility, prediction, speculation, deduction and necessity.
The Science of Health - "Research has demonstrated that an imbalance in brain chemicals can contribute to the development of some mental disorders. It’s suspected that this chemical imbalance impedes the ability of the brain to send messages in between
Topics for personal reflective essays on personal experiences What Are the Most Interesting Reflective Essay Topics. In reflective essays, students are required to write about past events and the experiences they got out of them.