Scientific Writing

The sentence is not complete;

Until the centrifuge is repaired. 

Mouse R eat pellets by testing time. 

This sentence doesn't make sense.

Your subject and verb should agree. If your subject is singular, so should your verb. A plural noun calls for a plural verb. 

Exceptions: 

• If a subject has two or more parts joined by or or 
• nor, the verb should agree with the part nearest to the verb. 
• Collective nouns [i.e. group, jury] can be treated as singular or plural, depending on whether they refer to individuals or a unit. 
• Consider each, either, neither or one to be singular use a singular verb. Both, few, many, others and several are considered plural and require plural forms of verbs. Use context to determine the verb forms for all, any, enough, more, most, none, and some.

The hardest task on my list were to master cryotherapy.

While perusing the project proposal, it is difficult to read. 

As a brilliant scientist, that allows him access to the CERN Supercollider. 

When a student requests an extension, they demonstrate poor time management skills. 

Although a respected teacher Dr. J made some unethical decisions. 

Apostrophes are typically used to show possession of an item, or contractions. 

Possessives without apostrophes include its, your, their, and whose.

Rachel borrowed they're microscope. 

they're [they are]