Answer:
1. Es una lástima que el río esté contaminado.
2. Me sorprende que haya peces.
3. A nosotros nos gusta que los vecinos quieran conservar el río.
4. Mi compañero de cuarto teme que sea tarde.
5. Ojalá que el gobierno proteja más el medio ambiente en el futuro.
Explanation:
You must use the subjunctive to construct the following sentences:
1. ser una lástima / río / estar contaminado
2. sorprender (yo) / haber / peces
3. a nosotros / gustar / los vecinos / querer / conservar / río
4. mi compañero de cuarto / temer / ser / tarde
5. ojalá / gobierno / proteger / más / medio ambiente / en el futuro
The present subjunctive is sometimes used as a form of imperative or in subordinate sentences after certain expressions that indicate a present or future action.
To form the present subjunctive of the regular verbs, we take as root the infinitive of the verb without the ending "-ar", "-er", or "-ir" and add the following disinsections:
-AR: -e, -es, -e, -emos, -éis, -en
-ER / -IR: -a, -as, -a, -amos, -áis, -an
The transaltion:
1. It is a pity that the river is polluted.
2. I am surprised that there are fish.
3. We like that the neighbors want to conserve the river.
4. My roommate fears it's late.
5. Hoepfully the government will protect the environment more in the future.