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The phrase "are two common forms" is correct and usable in written English.
It can be used when discussing or identifying two prevalent types or variations of something.
Example: "In the study of literature, there are two common forms: poetry and prose."
Alternatives: "represent two typical types" or "constitute two usual forms".
Exact(13)
Faith — yes, that's her real name — explains that there are two common forms of curses.
There are two common forms of such protection, Ms. Turner said: savings overdraft, in which money is transferred from your savings to cover the exact amount of the overdraft for about $5 a transfer; or an overdraft line of credit, which will cover any checks that are written when you do not have money in your account.
There are two common forms of esophageal hiatal hernia: "sliding hiatal hernia" and "paraesophageal hernia" [5].
Calcium carbonate and calcium citrate are two common forms.
There are two common forms of aerated static piles: individual piles and extended piles.
Crib-biting and windsucking are two common forms of equine stereotypic behaviour.
Similar(47)
Monetary, non-monetary, and consensus exchanges are three common forms of value exchange.
Canine hip dysplasia (CHD), elbow dysplasia (ED) and post cruciate ligament disease OA are three common forms of canine OA [ 2].
Raney nickel, a finely divided nickel-aluminium alloy, is one common form, however related catalysts are also often used, including related 'Raney-type' catalysts.
There are two common allelic forms, and the 14 repeat containing short variant (S) is associated with slower clearing of serotonin from the synaptic cleft [29].
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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