#	Grammar error	Example correct	Example (incorrect)	WProofreader AI Eng	WProofreader Am Eng	Grammarly free	Language Tool	Sapling AI
1	incorrect sentence structure	There will always be people who hate public transport	And people who hate public transport, there will always be.	yes	no	no	no	yes
2	every day - everyday	Death was an everyday occurrence during the Civil War.	Death was an every day occurrence during the Civil War.	yes	yes	yes	yes	no
3	its / it's	The dog hurt its paw.	The dog hurt it's paw.	yes	yes	yes	yes	yes
4	less/fewer	We must try to spend less money.	We must try to spend fewer money.	yes	yes	yes	yes	yes
5	that/who	I can't find the books that I got from the library.	I can't find the books who I got from the library.	yes	yes	yes	no	yes
6	then/than	Let me finish this job, then we'll go.	Let me finish this job, than we'll go.	yes	yes	yes	yes	yes
7	your/you're	Put your toys away now - it's time for bed.	Put you're toys away now - it's time for bed.	yes	yes	yes	yes	yes
8	there/their	The museum is closed today. We'll go there tomorrow.	The museum is closed today. We'll go their tomorrow.	yes	yes	yes	yes	yes
9	first of all	First of all, I’d like to ask you a few questions.	First of all I’d like to ask you a few questions.	yes	yes	yes	yes	no
10	omit hyphen	There are hyphens in "well-to-do".	There are hyphens in "well to do".	yes	yes	no	yes	no
11	Missing a comma after an introductory phrase	First of all, I’d like to ask you a few questions.	First of all I’d like to ask you a few questions.	yes	yes	yes	no	no
12	Missing a comma in conditionals	If anyone calls, just say I'll be back in the office at four o'clock.	If anyone calls just say I'll be back in the office at four o'clock.	yes	yes	yes	yes	no
13	Incorrect subject-verb agreement	I think you're wrong.	I thinks you're wrong.	yes	yes	yes	yes	yes
14	сount mass noun error	Do you have any information about/on train times?	Do you have any informations about/on train times?	yes	yes	yes	yes	yes
15	Incorrect form of the verb	Brandon’s got a new pair of glasses.	Brandon’s getted a new pair of glasses.	yes	yes	yes	yes	no
16	Incorrect word contraction	If we persevere, we cannot but succeed.	If we persevere, we cann't but succeed.	yes	yes	yes	yes	yes
17	Morphological error	It's a quick journey.	It's a quickly journey.	yes	yes	yes	yes	yes
18	Incorrect noun	Many people never do any exercise.	Many person never do any exercise.	yes	yes	yes	yes	yes
19	Possessive case	Britain’s coastline is very beautiful	Britains coastline is very beautiful.	yes	yes	no	yes	yes
20	Incorrect determiner	That’s an amazing bit of news.	That’s the amazing bit of news.	yes	yes	yes	yes	no