(February 2013) Durham tubes are used in microbiology to detect production of gas by microorganisms. They are simply smaller test tubes inserted upside down in another test tube. This small tube is initially filled with the solution in which the microorganism is to be grown.
A compound predicate is two or more simple predicates joined by a conjunction that indicate actions by the same subject. Example : Bill picked up the mail and walked the dog.. Bill is the subject for both verbs.
A simple predicate is a verb or verb phraseâand thatâs all. It doesnât give any more information about the verb or verb phrase, which is why the predicate is considered âsimple.â To identify a simple predicate in a sentence, ask yourself what the subject does or is, but remember to focus only on the verb or verb phrase itself. When we want to know what a subject does or is, we look at the predicate in a sentence. Predicates can either be simple or complete. What is a simple predicate? Read on for some helpful examples. Simple Predicate Examples: Verbs as Simple Predicates