Grammar and spelling errors are normally everywhere in a scammer's profile and message. You can easily spot it, especially when the scammer shows you he/she has good education background such as Masters degree.
What to do if you have become victim of online dating scams
If you think it is a scam, it probably is. The red flags are always there. Anyone asking for money online, when you have never met them in person, is pretty much a scam. Don't fall for it.