-ing: This is a very common suffix used to form the present participle of verbs, indicating an ongoing action. For example, "walking", "singing", "running".
-er: This suffix can be used to form nouns that denote someone or something that performs an action. For example, "teacher", "baker", "runner".
-or: Similar to "-er", "-or" can also be used to form nouns denoting someone or something that performs an action. For example, "actor", "editor", "governor".
-ize: This suffix can be used to form verbs that indicate the process of making something or becoming something. For example, "modernize", "organize", "legalize".
-ify: Similar to "-ize", this suffix is used to form verbs indicating the process of making something or becoming something. For example, "beautify", "clarify", "purify".
-ate: This suffix often forms verbs that indicate a process or action. For example, "activate", "validate", "generate".
Ultimately, the specific suffix used depends on the word and the intended meaning. These suffixes are just a starting point, and there are many other suffixes that can indicate action or a state of doing.