Looking at subjunctives, can you name a couple of instances in which a subjunctive is used, and how it is formed for regular verbs

The subjunctive is used to demonstrate uncertainty, and is also used following a large number of constructions, including thoughts and opinions in the negative. The subjunctive is formed by taking the 3rd person plural present indicative of the verb, removing the -ent ending and adding the following endings: -e, -es, -e, -ions, -iez, -ent