Grammar questions

1. (My husband Mark and I both do volunteer work) but (Ryan was only six years old) -- two independant clauses conected by the conj. but? -- Well, yes... BUT  sample sentences should make some sense, Fernanda!  There is no evident relationship between the two facts, so they should not even be in the same paragraph, much less the same sentence.  'I drive and my wife rides shotgun' -- two independent but RELATED clauses.

2. The principal has distributed a list (that shows the costs of buying supplies in developing countries)

the sentence between brackets is an adj. phrase and a postmodifier of "list", which is a direct object? -- Yes

3. Seventy dollars would buy (a well)

a well is a direct object in this sentence? -- Yes

4. We thought it was very nice (that he wanted to do something important)

the clause between brackets is a relative clause? which is its function? -- Yes.  It is an adjective complement

5..that he wanted to do something important

is it a non-finite verb (to-infinitive)?-- 'To do' is.

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two independant clauses conected by the conj. but?

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Use the "I"  (italics) button in  your editor. Same about bolding (B) 

<>good at these things