Trouble-some twos: The case of Which Vs That

POINT TO REMEMBER #1

• If the sentence makes sense and stands independently when you remove the part that you intend to put after which/that, use WHICH

• If the sentence does not make sense without the part that you intend to put after which/that, use THAT

POINT TO REMEMBER #2

• 𝗨𝘀𝗲 comma before WHICH

• 𝗗𝗼 𝗻𝗼𝘁 use comma before THAT

e.g.

Instead of: SARS-CoV2 infects cells, 𝘄𝗵𝗶𝗰𝗵 express the ACE2 receptor.

Use: SARS-CoV2 infects cells 𝘁𝗵𝗮𝘁 express the ACE2 receptor.

The sentence preceding 'which' does not convey the intended message on its own, therefore, the later part of the sentence is required.