write + if only ...
kaki saesureba
if only ...; all it takes is ...
meaning: if you just write
少し待ちさえすればすぐ順番が来るよ。
sukoshi machi saesureba sugu junban ga kuru yo.
Your turn will come right away if you just wait a bit. casual
お金さえあれば旅行に行けるのに。
okane sae areba ryokou ni ikeru noni.
If only I had the money, I could go on the trip. casual