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The phrase "are two common types" is correct and usable in written English.
It can be used when introducing or discussing different categories or classifications of something.
Example: "In the study of literature, there are two common types of narrative structures: linear and non-linear."
Alternatives: "represent two typical categories" or "constitute two prevalent kinds".
Exact(26)
CHOICES There are two common types of special-needs trusts.
There are two common types of abortion in horses: virus abortion, specifically viral rhinopneumonitis, and the Salmonella type.
There are two common types of rotors in wind turbines.
There are two common types of PCB – through-hole and SMT.
For those who are wondering what I'm babbling about: there are two common types of touchscreens.
There are two common types of power supply: linear and switch-mode.
Similar(34)
There are three common types of shots in hockey: the slap shot, the wrist shot, and the backhander.
There are three common types of neighborhoods in conventional CA models: Von Neumann, Moore, and Circular neighborhoods (Kocabas and Dragicevic 2006; Liu and Phinn 2003).
Chest pain is a typical symptom of acute coronary syndrome (ACS), of which there are three common types: unstable angina (UA), ST segment elevation (STEMI) of myocardial infarction (MI), and non-ST-segment elevation of MI (NSTEMI) [1, 2].
10 QuesThere You areays Wanted to Ask a Gynaecologist. 10 Questions You Always Wanted to Ask an Agoraphobe. 10 Questions You Always Wanted to Ask an Ugly Person.
There are three common types of cross-validation: Repeated random sub-sampling validation.
More suggestions(2)
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com