Почему тут стоит(joining) а не join. is kate joining us this evening?

Да правильно,пресент континиос

Потому что здесь используется время present continuous. am/is/are +

Hi. i'm from england. we speak english. the capital of england is london. the symbol of england is a rose. there are many big cities in england. the weather here is very changeable. it often rains here. if you go out to work in the morning in spring weather, it may become autumn in the evening when you come back. the english people are friendly and polite. they always are ready to give you a help. there are many sightseeing places in london : big ben which is known all over the world, westminister abbey. here you can see the tombs of kings and queens and other famous people. welcome to london and you will see many interesting places.

The International Red Cross and Red Crescent Movement is an international humanitarian movement with approximately 97 million volunteers, members and staff worldwide, which was founded to protect human life and health, to ensure respect for all human beings, and to prevent and alleviate human suffering. Within three distinct organizations that are legally independent from each other, but are united within the movement through common basic principles, objectives, symbols, statutes and governing organisations, there are the International Committee of the Red Cross (ICRC), that is a private humanitarian institution founded in 1863 in Geneva, Switzerland, in particular by Henry Dunant and Gustave Moynier. Its 25-member committee has a unique authority under international humanitarian law to protect the life and dignity of the victims of international and internal armed conflicts. The ICRC was awarded the Nobel Peace Prize on three occasions (in 1917, 1944 and 1963).