Respuestas
1. He said that about 94% of living things lived in water.
2. He said that Man had only explored about 5 % of the ocean.
3. He said that in 100 years. the sea would cover a lot of land.
4. He said that people had dumped a lot of rubbish in the oceans until the 1970s.
5. He said that pollutions was destroying many ecosystems.
Para cambiar las oraciones al "reported speech" debes tener en cuenta que estas comentando algo que alguien dijo por ello los verbos de las frases deben retroceder al pasado siguiendo unas reglas:
Cambian:
Presente simple > Pasado simple
Presente continuo > Pasado continuo
Presente perfecto > Pasado perfecto
Pasado simple > Pasado perfecto
Can > Could
Will > Would
must > Had to
May > Might
como tambien tienes que tener en cuenta que hay algunas que no cambian como son: pasado perfecto, pasado continuo, might, should, could, mustn't.
1. about 94% of living things live in water.
Presente simple > Pasado simple
Le agregas el comentario "He said that" para comentar lo que dijo entonces:
He said that about 94% of living things lived in water.
2. Man has only explored about 5 % of the ocean.
Presente perfecto > Pasado perfecto
He said that Man had only explored about 5 % of the ocean.
3. in 100 years. the sea will cover a lot of land.
Will > Would
He said that in 100 years. the sea would cover a lot of land.
4. people dumped a lot of rubbish in the oceans until the 1970s.
Pasado simple > Pasado perfecto
He said that people had dumped a lot of rubbish in the oceans until the 1970s.
5. pollutions is destroying many ecosystems.
Presente continuo > Pasado continuo
He said that pollutions was destroying many ecosystems.
En este link encontraras otro ejemplo de tiempos verbales : https://brainly.lat/tarea/10429504