Question

1. canal: a passage of water *that* boats can travel canal: a passage of water *that* boats can travel
[What is the part of speech of *that* in the phrase?]

2. Boats can travel a passage of water.
3. Boats can travel on a passage of water.
4. Boats can travel through a passage of water.
[Which one is grammatical of the three?]
..................
Do you mean #4 is right?

canal: a passage of water that boats can travel
a passage of water through which boats can travel
a passage of water which boats can travel through
a passage of water *where* boats can travel
a passage of water *that *boats can travel

Travel is an intransitive verb, so 'that' is a relative adverb. We can use 'that' instead of 'where'. 'Where' is a relative adverb in this phrase,isn't it?

Answer 1

1. canal: a passage of water *that* boats can travel canal: a passage of water *that* boats can travel
[What is the part of speech of *that* in the phrase?]
<b>Already answered in earlier post.</b>
2. Boats can travel a passage of water. <b>no</b>
3. Boats can travel on a passage of water. <b>no</b>
4. Boats can travel through a passage of water. <b>yes</b>
[Which one is grammatical of the three?]
..................
Do you mean #4 is right? <b>yes</b>

canal: a passage of water that boats can travel
a passage of water through which boats can travel <b>yes</b>
a passage of water which boats can travel through <b>yes</b>
a passage of water *where* boats can travel <b>yes</b>
a passage of water *that *boats can travel <b>no</b>

Travel is an intransitive verb, so 'that' is a relative adverb. We can use 'that' instead of 'where'. 'Where' is a relative adverb in this phrase,isn't it?
<b> Yes. Study this:
https://english.tutorvista.com/grammar/relative-adverbs.html</b>

Answer 2

Which phrase from the passage refers to a key element found in myths?