Breakdown of Wir haben den Verdacht, dass der Nachbar lügt.
haben
to have
wir
we
der Nachbar
the neighbor (male)
lügen
to lie (tell a falsehood)
Questions & Answers about Wir haben den Verdacht, dass der Nachbar lügt.
Why do we say den Verdacht (the suspicion) instead of einen Verdacht (a suspicion) here?
Because the exact nature of the suspicion is immediately explained in the dass clause, it is treated as a specific, known thing, so the definite article den is very natural. However, saying einen Verdacht would also be completely correct here.
Could we use the verb vermuten (to suspect / to assume) instead of the noun phrase den Verdacht haben?
Yes, you could say Wir vermuten, dass der Nachbar lügt. The meaning is very similar, but den Verdacht haben carries a slightly stronger, more accusatory tone (like suspecting deceit or a crime), whereas vermuten can simply mean a neutral guess.
How would I express this underlying suspicion directly as a question using the modal particle etwa?
If you wanted to voice this suspicion directly to someone else, you could ask Lügt der Nachbar etwa?. Adding etwa perfectly captures the exact disbelief, concern, or negative expectation that the noun Verdacht describes in this statement.
Is lügen used for telling small, harmless lies as well?