if need be 必要ならば

if need be　は　if the need is/exists, if the needs are/exist の略で、need は名詞、be は原型動詞。if need be, if needs be の両方をおぼえておけばいい。 0:37 that is an image of the Chinese military doing mock drills. they're training so they can be ready to take on rioters in Hong Kong, if need be. この写真は中国の軍隊が予行演習をしている写真です。この訓練は必要とあらば香港のデモ隊を制圧するためのものです。

China to send troops into Hong Kong. Blames US.

0;38 Indonesian officials say they will continue to search all the villages in the area and force residents to evacuate if need be. インドネシア政府関係者は火山付近の村を探索、そして必要なら住民の強制避難を行う方針だ。

Mass evacuations in Bali as volcano spews ash

0:55 because they can get to the hospital if need be in time.自宅出産を選ぶ理由は（近くに病院があり）もし病院での出産が必要な時はすぐに病院に行けるからですね。

Home Birth As Safe as Hospital Delivery

5;34 the children are encouraged to spend their days without a top so that they are hardened against the cold. they just rub each other to keep warm if need be. 児童たちは上着無しの（朝礼や体育の授業への参加？）を奨励される。子供たちは必要なら背中のさすり合いっこで暖を取る。

Japan Child Suicide Epidemic Driven by School Discipline