N4 — outside your level filter
Is said whole, with nothing composed onto it and takes no だ／です, so there are no forms to conjugate.
ようこそ
youkosowelcomeN4expression
Example sentences2
日本へようこそ。
nihon e youkoso.
Welcome to Japan. neutral
ようこそ、わざわざ遠いところをありがとう。
youkoso, wazawaza tooi tokoro o arigatou.
Welcome, thanks for going out of your way to come all this way. casual