请帮我看看这种英文句型有没有问题,如果有,要怎么改-There are 2 essential factors need to beconsidered when choosing a supplier in another country.-There are 2 essential factors need to be considered when aiming to improve the health of the workforce.-There are 2 essential factors need to be considered whenpreparing to sell a company.-There are 2 essential factors need to be paying attention on whenworking in a multi-cultural environment..

请帮我看看这种英文句型有没有问题,如果有,要怎么改
-There are 2 essential factors need to beconsidered when choosing a supplier in another country.
-There are 2 essential factors need to be considered when aiming to improve the health of the workforce.
-There are 2 essential factors need to be considered whenpreparing to sell a company.
-There are 2 essential factors need to be paying attention on whenworking in a multi-cultural environment..