@Override
	public String write_the_aff(){
		Sentence_tree st = this;
		for(int index = 0; index < st.children.length; index++){
			if(st.children[index].root.get_function().equals("aff")) return " se ";
			else if(st.children[index].root.get_function().equals("aux_tps")){
				for(int i = 0; i < st.children[index].children.length; index++){
					if(st.children[index].children[i].root.get_function().equals("aff")) return " se ";
				}
			}
		}
		return "";
	}