Yes, they are grammatical .
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Ye ThuWhat you have is not completely wrong, but we normally leave out the article in expressions that tell how we travel.taken by a ferrytaken by ferry
vkr6078@CalifJim, could you please give few more exceptions where we can leave out articles like the ones you posted?There are far too many to list. I don't know of an exhaustive list that exists anywhere. They have to be learned separately like individual vocabulary items.